Not first person, but Starsector is my go-to for my SciFi fix. Trading, pirating, smuggling organs and selling them on the black market, exploring star systems for suitable planets to establishing your own thriving colony...there is a ton of options and something for everyone.

https://youtu.be/acqpulP1hLo

The biggest competitor to Star Citizen right now is Elite: Dangerous. I've played it a lot and it's pretty good. You can play solo or online, too. It can feel a bit slow and it doesn't hold your hand when it comes to learning how to play. There's combat, trading, and exploration. Also pretty active communities online.

If you want to go back in time a bit, there's also the X series from Egosoft that's spanned back many years. There are a few installments and more is being developed. These games are definitely more colorful in several ways than Elite: Dangerous. More of a focus on the Rule of Cool than trying to be real sims.

Haven't played Star Wars: Squadrons, so I don't know the state of the multiplayer side of things. It does offer a solo story mode, apparently. May be worth looking into.

Every now and again I'll think about games like Freelancer, Freelancer 2, X-Wing, and the Wing Commander franchise for straight sit-in-cockpit combat action. Those are very old- early Mid 1990's to early 2000's. If you feel like something retro and can run them, those are options. I wish we had more games styled after those early space sims.

X4: Foundations?

There's always No Man's Sky, I haven't played it for a year or so but I know they have added a ton of new stuff in the last few updates. Maybe not completely fulfilling, but could kill some time pleasantly

Gotta mention FTL: Faster Than Light. Not a 6dof game, but great fun commanding your crew and navigating some fun encounters.

I was just browsing Steam and found SpaceBourne 2, which I mentioned in another Freelancer-related thread. But it looks pretty solid/promising, based on the reviews. I wishlisted it, but can't personally vouch for it.

Outer Wilds and Subnautica don't have ship fights but they give off a similar feel to star citizen/ no man's sky (to me).

https://store.steampowered.com/app/753640/Outer_Wilds/
https://store.steampowered.com/app/264710/Subnautica/
https://store.steampowered.com/app/848450/Subnautica_Below_Zero/

I'm currently loving a bunch of games in the factory building genre so can I offer you some Dyson Sphere Program in these trying times?

Imagine factorio but you're in a mecha suit building factories spanning multiple planets eventually multiple stars, to build exponentially more complex resources until you're able to shoot swarms of dyson reflectors and eventually build a rigid sphere in orbit.

Still in Alpha after several years, but exquisitely polished, runs fine on legacy machines, excellent responsive dev team, combat is being added soon.

If you're into colony sims, check out Space Haven.

I mean, Hotline Miami in space still counts?

Heat Signature

Launch Everspace 2 (especially since you've kickstarted it), it's a great one of those and not as intimidating as something like Elite Dangerous. Although, if you want to go deep, that's the way to go..

Try Everspace. It's a roguelike space shooter. Controls feel very free and intuitive. There's also a sequel that's out now that's more of an open world space RPG (same shooting mechanics but not a roguelike). But you can try the first game for only 4 dollars and see if you like the combat.
https://store.steampowered.com/app/396750/EVERSPACE/
https://store.steampowered.com/app/1128920/EVERSPACE_2/

For your space reading adventure I love Escape Belocity: Nova. It's very old but I've had so much fun with it if it's runnable on new machines.

I'll second the recommendation for the X series from Egosoft and the latest X4 has had a number of expansions that make it worthwhile, it's made by a small team and is a bit fiddly at times but it's definitely worth a shot.

Rebel Galaxy is an exploration/open world-ish space game with weird controllers but a pretty fun gameplay. You get to fine-tune different classes of ships with a variety of weapons, shields, engines, etc. while completing missions to earn money and earn reputation with different factions.

It's basically Sid Meier's Pirates, but in space and with a modern look. I found it highly entertaining.

If you like sandbox building, Space Engineers. There are so many good mods to give the game some life and nothing is more satisfying than building your own ship from materials you mined.

I can't help but feel that all of us old timer "why won't they make another Tie Fighter?" guys did not show up when they did exactly that on Star Wars Squadrons.

But also, hey did you know they made another X-Wing/Tie Fighter game called Star Wars Squadrons? That happened.

Probably not what you are looking for but I found myself enjoying the JumpLight Odyssey demo yesterday. Has a very 1970 Anime vide ala Star Blazors.

If you're into classic 6DoF games, then the Descent series (including Freespace) and Forsaken are go-to plays for me. We're talking late 90's/early 00's, though, so take that with a grain of salt.

have you played the star ocean games?

the focus isn't on the ship, but it's very much a space/scifi focused game.

How about Empyrion - Galactic Survival? Kind of like Space Engineers but with better singleplayer content.

Stellaris! It's a game like civilization, but in space. I have hundreds of hours in and it has been responsible for many nights of me staying up late than i should. Constant free updates and many options for paid dlc to expand your options.

@ThunderQuack is Eve Online still around that used to be fun