I recommend a nail strengthener.

I'm having a hard time because my nails have become thin and brittle due to frequent gel manicures.

Since I couldn't keep going to the salon, I applied nail nourishment frequently, and my dryness has improved significantly.

I've tried other products as well, and those dry quickly and don't smudge easily, but the slight downside of this product is that it takes a long time to dry.