if they are LL Beans, they have a re-sole program you can do- it's not free, but it's cheaper than new boots.
you could try sewing them yourself with a heavy needle, waxed canvas
thread - but the waterproofing will still be mostly gone.
Growing on my small acre in SW USA; Fruit/Nut trees w/ annuals, Chickens, lamb, pigs; rabbits and in-laws onto property soon.
Long term goal - chairmaker, luthier, and stay-at-home farm dad. Check out my music! https://www.youtube.com/@Dustyandtheroadrunners