Practicality for one. How do you change the world economy when they couldn’t even get together to manage a respiratory disease by wearing masks and isolating for 2 to 3 weeks.
You could say the same about UBI. Proper implementation requires wealthy to give up their wealth. Do you see that practically happening?
There is nothing inherently wrong with capitalism as a concept. It’s how it’s abuses. Regulation and rules to circumbet that can help.
Except that the system inherently causes capital accumulation and rewards abusive behavior. The kind of rules and regulations you're thinking of work against capitalism and the wealthy are allowed to circumvent those rules anyway (see how they avoid paying tax).
Communism doesn’t work. China shows some totalitarianism works, but I don’t want to lose personal freedoms for the greater good.
I'm not going to get into the details of what communism actually is supposed to be or how the USSR or China are not necessarily the way to communism. I'm just going to point out that socialism does not have to go the way of USSR or China.
What system would you suggest would address capitalisms faults yet has a chance to actually happen?
Socialism. Not the Leninist way but the Marxist way. Marx described socialism as a process, a series of steps necessary to dismantle capitalism and establish communism. He didn't go into details on what those steps are or how many steps they may or may not be. So to be true to Marx I'm not saying "let's completely throw capitalism in the bin and go into planned economy" but rather lets treat it as a process. We don't need to establish communism, but lets take step by step towards a better future.
And as such I think the smallest first step, which in many ways is already a huge step, is changing the ownership of companies. Everyone working at the company is also the owner of the company and gets a say in how the company operates. That change alone would improve working conditions and arguably have companies do less shady shit. But realistically I don't see it happening any more than I see UBI happening in the way that you imagine.