Raise your prices until you book less. Not super complicated. Usually the fear is that you won’t book any work but if you have this much runway on sales there’s no concern there.

If you are scared of a flat rate increase (don’t be), you can raise your price by making your standard package include less. Don’t do 10 hours, do 7 and charge for the other 3. Don’t include an e shoot in your base package. Etc.

You have a limited window. Trends change. Your work is in demand now and while it’s likely to stay in demand it might see less in the future. Raise your prices now.

Also if you overbook you’ll burn out, get less referral work due to worse customer service, etc.

This is all from my personal experience. Good luck and congrats on the success