I had read or I think I had read but MC has system which is op and can make him equally powerful to any opponent ( no limit).
Uh, are you looking for recommendations or is it a forgotten title? And "equally powerful" is a very vague description of any system.
Black Tech Internet Cafe System and God Level Store Manager both have systems that make the MC basically god level inside their own store/domain even at day 1 when the MC has no power of his own. is that what you mean?
There was a web comic with a villain that had a sword(and accompanying soul) named grace that gave the wielder like 99% of his opponent's strength. I don't think its what you're looking for though.... the title was "wiglaf and mordred" it's kinda slice of life comedy(i think... i cant remember... i haven't read it for like years)
there is a novel where each time the MC got killed he will resurrect and the system will arrange for him a way to defeat the enemy by either increasing his cultivation, constitution... Opening Reward 100 Million Lives
it's 'Opening Reward 100 Million Lives' not many translated chapters but you can always mtl with DeepL