Any success strengthening nails?

I’ve very nearly aged out of eczema (knocks on wood) but my fingernails still have all the resilience of a waterlogged piece of tissue paper, unless I spend like an hour a day absent-mindedly rubbing horse and mane cream in lol

My favorite sport is swimming, and if I do it regularly, my nails are so weak they’ll tear down to the bed.

i have tried all manner of strengthening polishes to no avail. Anyone had any success?