Hey S, super inspired by your motivation. Have thrown some rambled thoughts on each of your points below, but I think my tldr is definitely make sure not to burn yourself out (it's easier than most people think - though you obviously understand yourself better than I do), and that at the end of the day you still deserve to live your own life (i.e., don't aim to be a perfect altruism machine).
I'd suggest reaching out to 80K and other EA careers advising organisations if you haven't already. I think they'd be keen to chat to you. I made a comment on EA careers resources a while back which I'm going to be lazy and tag instead of typing out more granular advice.
Also, most people's preferences change over time, so try to plan with that in mind, and don't be upset at yourself if you find that you no longer want to do things the way you'd previously envisioned.
Downvoted as I don't think this type of content should be tolerated on the EA Forum. When I click on posts on April 1 (which coincidentally is my birthday), I expect to leave after a 'ha ha funny', not a 'ha ha, this is fine, oh wait, no it's not, someone please help me deal with my now increased existential dread'
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Yours sincerely,
Mitchell (is unfortunately not) Laugh(l)ing
I worry I'm too pessimistic in general, but the world economy (and general living standards), have improved significantly over time, and farmed animal welfare seems to be a lot worse. That seems to be evidence to me that amazing technological progress won't be sufficient for animal welfare progress.
Also just updating my comment to say I agree with all of the comments you received on your Donating Everything: Update post.