See this is some solid propaganda. He clearly just fucked up because he's old, and it's hard to deny that that's what happened, and it definitely makes him look silly.
It doesn't have anything to do with his record, or what he'll do with another 4 years, or how terrifying the prospect of another Trump presidency would be -- but I think hammering on this kind of thing will be effective. I think you should focus on this kind of stuff (and, the general "the economy is so so so bad" without even referencing Biden, and just trusting that people will connect the dots). I could see that being pretty impactful -- definitely more so than making up things about people walking out of his Morehouse speech, or trying to imply he's corporate-friendly which can lead to teeing people up to come in with "well akshually" and spread information about what he actually did.
Way too unsubtle. Everyone's just gonna laugh and downvote you. You gotta pretend you really want him to get elected, but you're just despairingly concerned because he's old and flailing, and can't possibly hold a candle to Trump and anyway he threw away and betrayed all his voters when he personally bombed Gaza, and anyway you wish we could have Jill Stein and you'll probably vote for her, not because you want Trump to win, but because it's the only real way we'll ever see some progress in this country.