Here's a link that will help you Curly Hair Basics | Live Curly Live Free identify your properties. Which will help you identify the ingredients/products you want to use. The e-book available on that website would be a good investment for you. All of the information in one place.

Your curls are beautiful. Why would you want to stop the shrinkage?? Most of the ladies on would die to have those curls. Maybe a good goal for you is to make what your have the best they can be!
3a (Corkicelli), highlighted, fine, low porosity

HGs: Anything Sevi; Curly Kinks Satin Roots, Curlycue ReNew and Coil Jam; homemade FSG and okra gel; soap bars; UFD Curly Magic; Botanical Spirits Jellies, CJ Repair Me, Aloe Fix