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Earth Defense Force 4 or 5 can be good “training” games. They’re 3rd person shooters, you’ll spend more time moving around than aiming, since your targets will be giant insects, giant spiders, giant aliens and giant alien ships. Even playing online with randos is fine and fun, and I say that as a similar 30+ yo dude.
It’s a grindy game tho and, much like Dynasty Warriors, you should NOT let your pride dictate that you should “start with hard”. Go with medium and, if shit gets too hard, drop down to easy, get better weapons and more health, then come back with a vengeance
BAR - Beyond All Reason, for Total Annihilation/Supreme Commander style RTS, learned about this one in another thread here on lemmy
Zero-K - similar premise, plays different from BAR, also the graphics seem less demanding
OpenSoldat - 2D arena shooter. For anyone that never played or saw something similar, think of multiplayer maps of halo, quake or unreal, but if it was a 2D platformer
Not quite open source, but Daggerfall Unity is a FOSS update to the engine for Daggerfall, a game which Bethesda has made free for years now. You can get the game off GOG, too.