Is there a minimum number of deals I have to submit, or a funding volume I need to hit?

No. There is no deal minimum, no funding volume target, and no penalty for a quiet month. Levr is free for brokers, so you could submit one deal this year or twenty this month and nothing about your account changes. The only real expectation is responsiveness: once a deal is live with a lender, reply to their questions in the portal so the file keeps moving.