Hi, and welcome aboard!
The way I see it, it won't exist a perfect value for any game, since each one of them behave differently: Battlefield, for example, uses a quite aggressive sharpening filter on its own, so, in this case, increasing sharpness further more via Reshade will easily lead to oversharpening (the annoying halos around objects).
Anyway, Reshade is all about your personal preferences, so feel free to experiment which settings better suits for you and remember that, if you feel uncomfortable with your changes, you can always restore the original values by right clicking on them.
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