New user, Fiberglass nightmare, looking for ideas

Bought a home 4 years ago with a fiberglass pool in fair to poor condition. Limped along for 4 years Mosc issues, over the winter, pool emptied. Properly winterized, cleaned bottom to find a large crack. Can't find anyone reputable to touch a fiberglass pool in my area.
Now the repair is my job since the fiberglass company owner left me stranded with 2 no-shows after he agreed to repair if I did all the prep work. Since it's already prepped, I'm looking for any input from fiberglass pool owners on any specific fiberglass resins they use for pools?
Any helps appreciated.
Thx