The two drugstore curl enhancers that come to mind are KCCC (can find at Target) and AG re:coil (find at Ulta I think). I like ones that I find online since there's a much bigger variety!

You could also try mousse but I don't know anything about good ones.

I scrunch in my curl enhancer to wet hair right after the shower and then gel. You can also experiment with mixing your curl enhancer and gel together before applying it to your hair.
Coarse texture, normal-high porosity, normal elasticity (Komaza Care), very weak waves
cleanser: Redken Fresh Curls Shampoo, CJ Daily Fix

rinse out: GVP Conditioning Balm, CJ Repair Me, CJ Smoothing

jellies/creams: CR Curl Maker, KCCC, UFD Curly Magic
gels: CJ CQ, BRHG