You can stop pretending that an old guy talking like an old guy in what is obviously a media circlejerk that has nothing to do with "debate" invalidates the past 4 years of his administration pursuing and achieving breakthrough legislation.

Instead of surfing the bandwagon with "he old, me sad", acknowledge that despite mumbling, Biden has consistently instituted policies and funding for issues that people have been fighting for for decades in his first term and there's no real reason to vote against him or to spread some unrealistic measure of success.

Biden's investing in green and sustainable energy, he's providing funding for lgbtq unions, he's protecting national forests, complaining that he also isn't winning arm wrestling contests is completely unhelpful and demeaning the very good work he's been doing.

What can you do "besides prepare for Trump"?

Stop pretending Trump is an inevitability because you think wearing cynicism like a merit badhr looks cool on 4chan.

Explain to people how exactly irrelevant and unhelpful complaining about non-issues is when considering their next president.