I can tell what I’ve inferred, in hopes of increasing success.
First, make sure you’re receiving email at the one you used to sign up, or by the authentication service you used to sign up. See if any email has been put in a spam folder.
Secondly, I anticipate that OpenAI would want to see successful billings history, for their own security. Much earlier, though, others have been increased even while still in trial.
Essentially, in the form, make your business case, your application use and monthly plans, and current usage trends and users known. The more they know, the more they could agree. See rate limits page at the bottom for examples of app and company info one could provide (for that different kind of increase).
People are seemingly bumped up in tiers. 120->500, 500->1000, 1000->2000. Although you can write your case for more, I wouldn’t request more than the next jump in the form field, as this tier system and the amount you request might not be something an agent can override.
Ensure you are clicking from within your account so the organization field is auto-filled, and then also verify it.
Resubmission will replace any unprocessed request with the new one. Documentation doesn’t say if you lose your place in line.
Good luck. You might want to get another account opened and prepay credits for the interim.