I proposed the following suggested edits today that were approved:
I am still under 2000 reputation. Shouldn't I have received +2 reputation for at least one of them?
Quoting the help center:
suggested edit is accepted: +2 (up to +1000 total per user)
A quick look at your profile:
So it's likely you've had 500 edits approved at 2 reputation each, and hit the limit.