Okay, then, so the Sorcerer doesn't have a 9th level slot, an 8th level slot, and is down 1 5th level slot. We'll ignore that one because you're going to spend your time short resting often and get that back. Oh, wait, that's another "DM pwease help me" because rests aren't automatic, and the DM can, by the rules, set limits on how often you can benefit from a rest.
The Sims did cast stuff, though -- your Primary Sim is out the spells needed to summon the celestial (5th level slot) and upcasted planar binding (180 days, right?) so the Sim is out a 9th (not copied) and now an 8th and a 5th, which he cannot regain, even through sorcery points (if you're going to be a stickler about the specifics of the rule, it does say spell slots and doesn't make an exception for font of magic -- although technically the amount of spell point is part of an ability, which is it barred from ever increasing).
You have a 20th level spellcaster and his Sim that can't cast spells over 7th level, very interesting. Also, one of your Celestials is going away in 3 months, and you can't really get it back easily because the sim can't Planar Bind it like that again. Eventually, your sim is tapped on 5th level slots, and higher slots, if you're keeping the second Celestial around. Yours? Sure, you can maintain that one okay.