UPDATE: Use an app that uses Manual mode and add the clip-lens to the 1X lens. Get close, very close! Example apps are Camera+ 2, ProCamera, Obscura, Hydra, Halide, Moment, ProCam, Slow Shutter, Lenka. On the 13 Pro macro will auto focus at close range. The clip-on macro on 1X lens did work for me as well.
Protect your iPhone with a case. Consider adding a lanyard from Blackrapid - Wander Bundle (recommended by Cynthia) or Youowo Adjustable Lanyard (recommended by Diana).
High-end lens systems are available from Sandmarc (Mike and Charlene) and Moment (Diana, Roe, Cynthia and Melissa).
Dig around your old camera gear for a tripod. Any tripod. Consider visiting the Dollar Tree (sic) and look for a selfie-stick with a screw-on phone clip. Remove the clip and attach to your tripod.
Guy asked about specs for a new iPad. Several spoke in favor for the iPad Pro model, and they are happy with the large screen and mid-range on-board storage option. Consider taking your time and watching for refurbished M1 models to appear at the Apple website - as products to appear daily and act fast if you are ready to buy. It is best to visit a store and handle both Pro sizes to be sure of the purchase. An Apple Pencil will help with many photo editing processes. A cover with keyboard is helpful when you're not editing and stylizing photos.
