I'm in a similar place to you.
One thing I think about that I didn't see you mention in your post is the pressure to remain consistent with this rise in your moral standards.
i.e. if eating meat has a Badness Score of -20 but eating dairy has a badness score of -10, then going from vegetarian to vegan seems to apply pressure on you to give up all your other behaviours that fall between -20 and -10 on the spectrum. (Maybe you now have to care more about recycling or something.)
Cool. Is the site targeted at people new to EA?
As someone that already knows the basic concepts and the organizations, I don't feel a need to return to the website other than to see what's changed.
Maybe you could link to the EA Forum and the EA Job Board? Have a news feed containing original content, news articles, blog posts, or .impact hackpad posts? Have or link to a page of open research questions?
Features that would get people to return after they've become familiar with the basics.
Even if your goal is to do as much good as possible, you might do better in a field that really motivates you than in a field that typically produces high salaries but that doesn't interest you much. I also dislike applying for jobs - usually because the jobs I apply for are often jobs that I don't want. However, I like applying for jobs that I do want and that I think I'm qualified for. If you don't feel qualified for jobs in your field then I don't know what to say other than (1) maybe you are qualified but you just have a negatively biased self-image, (2) you can make yourself qualified by learning more and picking up new skills, and (3) figure out what you are qualified and motivated to do and go do that instead.
My best answer to "inability to believe in oneself" (and almost everything else) is rigorous organization. Track your time, set yourself at least daily, weekly, and monthly goals, develop routines (e.g. a morning routine), exercise regularly, set an alarm even on days that you don't have plans, etc. I started this about five weeks ago and saw extreme results almost overnight.
Some possible criteria: