Hello @Pro_Mickey_Artist, here are lists of brushes I know about and like very much. They should work on Krita 5 (I had no problem on it personally).
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David Revoy’s (38 brush set) was designed after the default brushes of Krita, “organised by group of colors to pick them faster and take better decisions while painting”. It’s free!
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Rakurri’s (86+ brush set) “is specially made for stylized drawings, though it contains brushes that can be useful for other styles as well”. It’s free!
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FizzyFlower’s (400+ brush sets!!) “contains mostly “cheat brushes” that will help reduce your painting process time”. It’s free!
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If you happen to be into space art specifically, there are great brushes listed there : Galaxies painting, question - Support and Advice / General Questions - Krita Artists (krita-artists.org). The 98+ universe ones cost only 5€ (Personally I think it’s way too cheap considering the huge amount of work put into this, so I paid more to support the maker), but every other iforce73’s 100+ brushes are free! He made also very good tutorials on Youtube on how to use his brushes (English captions available).
There’s also a great list of brushes there on the Krita Artists community: Brushes and Bundles category.
Other resources can be found elsewhere as well, with keywords such as “brush krita 5 bundle” on search engines, on Deviantart, on Gumroad, on Reddit, etc.
I’m available for questions if you have any 