Is there anything you're currently missing out on with your Xbox?
Do you have any public libraries around you might borrow physical games from? (Assuming your Xbox has a disc drive)
Depending on what games you want to play, Game Pass might still be a relatively cheap option, especially if you can find it cheaper (Live Gold codes should still work conversion-wise, but who knows how much they go for these days).

A used Steam Deck or equivalent handheld PC might be a great option or addition to tour setup, obviously depending on what games you want to play.

It might be an option that doesn’t come up much, but older/lower-spec consoles are an option: The Playstation 4 and Xbox Series S. They’re not available for recent big AAA games, but that’s less and less of the big trends. There have still been many games coming out this year for the PS4.

That’s, of course, if you’re really on a low budget for hardware. Otherwise, a PC is a great investment for games on Steam sales.

Best advice I can give is to look at online auctions, estate sales, and check out to see if there are any Goodwill's near you that specialize in electronics. You can run a lot of modern games on 10 to 5 year old hardware, probably won't be the prettiest build but hey if it works. Also remember you can always tear open a modern laptop for that sweet sweet storage.

Maybe try find some games that work on the mac?

There's also this project trying to get linux in a vm to run games on a mac(and also trying to install Linux on a mac, but I assume it might break macOS since bootcamp isn't a thing anymore, so the vm route is probably the better option):

https://github.com/AsahiLinux/muvm

https://m.youtube.com/watch?v=BbJMPfXTbbE

(I haven't tried it since I don't own a mac, just happened to find it when another friend who does have a mac was asking for similar advice to you previously, but he didn't end up trying it either)

I downgraded to the lowest tier, so technically they lost money on me.

Um... you need to sell that Mac and build a computer with DDR4 and maybe a 40 Series NVIDIA GPU (so as to not pay the high prices on both fronts), slap Linux on it (I'd recommend Mint or Pop_OS!), and learn how to set it up for gaming. That's stupid otherwise.