I gave you the strategy by which policies have actually changed in real time.
You yourself already ADMITTED that Biden has moved to the left on student loans. He's also moved to the left on mass incarceration, policing, banking, and environmental issues. All that movement to the left occurred because we put Obama over Clinton in 2008, because Sanders put heavy pressure on Clinton in 2016 (would have been even better if he won), because AOC, Omar, Pressley, Tlaib, Bowman, Bush, Casar, Lee, and Ramirez unseated establishment Dems in 2018, and because Sanders put pressure on establishment candidates again in 2019-2020 (would have been better if he won).
Meanwhile, your entire response to was to complain about three things that literally CAN'T be changed by the president, and suggest that's why you won't vote for him. The president can't determine tuition at HBCU's, he can't control commodity prices, and he can't change what already happened in the 1990s. But he CAN give students billions so they can pay for tuition, he CAN give people a stimulus so they can pay for commodities, and he CAN reverse the policies that were wrongly instituted in the 1990s.
The fact that you dismiss the 2nd list of things a president can do, and instead ask for things literally impossible for him to do, makes you look like an agent.