You are daydreaming. Nobody cares about American sanctions anymore, except Europe.
Look how that oil price cap worked. The discount for Urals blend is lowest in history, 10+% of heavy tankers in the world are carrying Russian oil, and Western companies lost monopoly on maritime insurance. Now Yellen is yelling that dollar is losing ground due to a fact that dirham and ruble are gaining weight in oil trade. What will be left of the US once dollar is over?
Done incompetently, like Biden has done, sanctions can be evaded. Strongly applied, like Trump would so, they work.