Congratulations. Good timing to tier up, tier 100 is limited to 2 uploads per day now...
I think you are pricing your t-shirts way too low btw. I started merch in June, sold ~60 shirts and made twice as much money as you. It's ok if it's an extremely competitive niche and you want to increase the price after a sale or want to tier up asap but otherwise it's not really a good strategy.
I'm following you btw. Hope to see your progress and more merch stuff soon.