There are a ton of good mobile games but the reason you can't find them is because 99% of what you see in app stores are paid advertisements. Every section is basically paid, and the few which aren't get botted by major companies. That app that has 5 million downloads and 4.6 average score? Most likely spammed with bots that give it 5 stars. Google Play is a disaster.
Here are some Android games I would absolutely recommend:
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Fancy Pants Adventures
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Data Wing
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The Battle of Politopia
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Sonny
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Plato
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Cube Escape Collection
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Pocket City (or its sequel)
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Bloons TD 6 (paid)
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Dicey Dungeons (paid)
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Dead Cells (paid)
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Downwell (paid)
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Baba Is You (paid)
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Levelhead (paid)
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Kingdom Rush series (paid, usually on sale though)
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If you own Netflix you get to play their catalogue of games for free. I recommend Into the Breach, Shovel Knight Pocket Dungeon, Oxenfree
I could go on, but the point is ignore everything you see on the store. The store is garbage. Try to look for games that are well-talked about online.
Edit: Forgot to mention, there's an app called MiniReview where you can browse game reviews from people who actually care. It's a good resource if you're looking for good games.