This is all reliant on the supposition that he'd want to change. I've never seen him give a genuine effort of change, I've seen him pretend to change because the spotlight was on his ass, like after his Twitch suspensions. I've seen him be friendlier to subs, but only after receiving hundreds/thousands relatively quickly. Every thing he tries his hand at ends up the same way, simply because his desperation/greed for money inevitably comes into play. This is the man who took $1250 to play games that he swore blind he never would (Minecraft) or ragequit then pretended he never planned to complete (Persona 3).
Of course he could redeem himself, but he'd have to accept that there's something to redeem himself for. I still to this day don't know if he's aware of his many faults. There's days I think he has to be, there's no way a sane person could illicit this kind of autism and not stop and think "maybe it's me that's causing this". I think at the start maybe he did but since then he's deluded himself to believe that everything bad online is just jealous trolls out to get him.
From what I've seen, he doesn't want or feel the need to change. People only ever really change when something major happens, even then change isn't guaranteed. To my knowledge, nothing major has happened to him, and things we would consider pretty big reasons for at least a bit of self-reflection, like our long-time friends having enough and making a video calling us out on our shit, or losing a long-term partner that we were apparently considering marrying. Even these things haven't changed him, not for the better at least, he only seems to be getting worse.
There's also the fact that while most of us don't care what happens to him 1 way or another, there are people out there who will make it their job to trip him up.
The biggest thing he could do right now that would maybe lead to further change, is to stop blocking everyone who says something he doesn't like. Sometimes, those people are telling him far bigger and harder truths than any "fan" of his like fagginz ever could.