The only major thing Republicans have been able to do is win minor concessions by threatening to effectively nuke the country. Democrats are not willing to hold the country hostage in the same manner because there are incredible consequences if the bluff is called. (A prolonged government shutdown stops poor people from eating, sick people from getting medical treatment etc. A refusal to lift the debt ceiling would place America in crippling debt and throw the world into a major financial crisis.)
During Biden's term, Republicans looked much stronger because the Supreme court had 6 Conservatives and the Democrats only had 50 seats in the Senate which included Manchin and Sinema. The Democrats have none of that leverage this time.