IBX boost, brush on strengther in a gel pot. That's what I use after I have done the IBX repair treatment, and clients need a bit more strength.
INK London , flubber basecoat will be my hero product as it gives strength and makes gel so very much more long lasting on weak nails. I have not used it to sculpt though.
Gelish , structure gel will strengthen , can also sculpt small extensions. Soak off. In bottle or in a gel pot.
I am sure there are lots more, but those are what I am familiar with.
Lamp compatability in curing will be what defines your choice I should think . What is your current brand of gel system?