Getting games running smoothly

Hello fellow Linux Magicians,
Since I am at work right now and my Bazzite is still not working how I want it to be I want to post a question here about all the tactics to get games smoothly running.
I already got two games running smoothly - Repo which worked right out of the box and Aska. On Aska I had the problem thatthe game hat stutters and an easy fix was to just use a different version of proton.
So I already know "If a game doesnt run smoothly, try other Proton services."

So the question is: Are there other programms I can use to get games running better? Are there other tricks I can use to make them running?

Two games that I know are not running right now are skull and bones and Helldivers.
Helldivers has weird frame issues, while the frames are high they randomly drop sometimes.
Skull and Bones totally not works.
It has veery low framerates and changing proton didnt changed a thing.
So: what are most fixes that I can try?
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