Book where a the main character cycles mana through his mana veins or channels or something?

This is literally the only thing I remember about this specific book. I assume it's some kind of fantasy, possibly some progression/LitRPG (but none of the ones that I can remember reading are right).

I believe that the main character (who I'm fairly sure is a man) actually like, "enters" his body to cycle mana through his channels or veins or whatever they call to strengthen them. I'm sure that he does something weird that makes him more powerful than other people. I vaguely recall the process being difficult or painful.

I believe that it involved cycling the mana through the channels either faster or using more mana to increase throughput to increase his power or something.

I can tell you it's not the following for sure:

- Arcane Ascension by Andrew Rowe - Cradle by Will Wight - All The Skills by Honour Rae

It *might* be The Completionist Chronicles by Dakota Krout, but I don't think it is (the friend that I asked this question to has read that and doesn't think it is either).

It's also completely possible that it's not traditional "Kindle Unlimited Progression Fantasy from the 2010's - 2020's" and that is' more "sold at Barnes and Noble in the 2000's" but those are my likely times/places to have read them.