SRS system should be more flexible

Give it time.

One of the unexpected things that new users have to deal with is that learning 2000 odd kanji like this is a hopeless endeavour without a memorization strategy. You can’t speed SRS up even if you feel really confident about it. If you can’t deal with the SRS system at level 1 then you’re probably better off using another method.

Good luck!

EDIT: There’s a gazillion things you can be doing whilst you’re waiting for reviews.