As a GM this has always irritated me about other GM’s complaining their players are too powerful. My dude, you’re literally omnipotent. Your players cannot be too powerful, because you are all-powerful. Just throw bigger baddies at them. You only have to worry if one player starts getting way more powerful than the rest of the party. Then you either have to make sure everyone is cool with that asymmetrical dynamic or buff everyone else up to their level. But a party cannot be too powerful, it’s just a lack of GM creativity. /rant

Edit: Dear GMs, downvoting this won’t make it less true. Relax your grip on the narrative and you’ll be surprised how much more fun everyone has.