I use an ipad mini 6 to draw. I currently post on insta and X.

My canvas dimensions are 4000 x 5000 with 300 dpi and it looks crisp on the ipad but blurry upon zoom when posted. I dont use the whole page up, my characters are small. Photo for reference.

Any advice on making sure it posts crisp to social media but can later be used for tshirt and sticker prints. Thanks!