We're trying to rewatch Invasion now that it's concluded (or cancelled). First season is heavy going, lots of parallel plots that only slowly intertwine if at all, and not necessarily so much happening in every episode.
Next will be a For all mankind rewatch to be fully prepped for the upcoming season 5. Let's see if we can time it so we can binge the new episodes without a week's wait in between...
Going through a Star Trek Voyager rewatch from the beginning. I’ve done this with TNG and DS9 a couple of times and constantly rewatch those episodes. I’ve only gone through Voyager once and I don’t rewatch it much, so it’s kind of newish to me again.
Other than that, reading my Star Trek novels from the thrift store and borrowing Blu-rays from the library to rip into my collection. I really want to do a watch of X-Files again!