Going by your Patreon page, you do about 6 commissions a month. Three for the $30 tier, 2 for $50, and 1 (idk how many characters) for the $100. Your biggest draws are $50 and $100 tier. If you drop the $30 tier, you could cut the amount of commissions you have to do by half. Another thing you could do is limit the $50 tier to 2 slots instead of 3.