What shaders and effects to apply on old games?

I want to play <the thing> game, which is an old one. What shaders and effects should i enable? I have 2070 super so i have no problem with the fps. Also i have the slider for maximum quality on nvidia control panel, but i don't know if this can affect somehow the old games.

And what about the presets found on this link : reshade.me/presets

Do i need sweet fx also?

You can use whatever shaders you feel like using and use them to adjust the game to your taste typically people would enable adjustments for contrast, brightness, saturation, bloom, sharpness, SMAA. If depth buffer is available, then also DoF, AO effects. If one is familiar with Photoshop type of color effects, I have a whole lot of those things on my github here: github.com/prod80/prod80-ReShade-Repository