Dems had a house majority for 2 years before losing it in 2022, and have had a tied senate for 4 years, although technically there has been more R than D for all four but Independents caucusing with the D tip them to 51:49 currently. But, to argue your point, there has been meaningful changes in the last 4 years with changes to how the FTC, SEC, and FCC operates with some of the largest fines ever given to companies like Facebook as well as increased IRS funding which led to a proportional increase in audits for the wealthiest Americans.

And the Obama Era gave us a Medicaid Expansion, would have completely changed to a single payer system if not for Senate Republicans.