Wow! If the leak is from the liner, the hardest part is finding it, but you can make repairs yourself even under water.

If the leak if from the plumbing, there's NO reason on an AG pool to not locate it and fix it. Above Ground Pool plumbing is rarely complicated.

Finding a leak requires a dye, like "Find A Leak" (one brand). Some are even fluorescent but I've not used them. You find the likeliest area by searching for where it's wet outside the pool. Turn off the pump and let the water get very still. Add the dye and wait. If it's near the leak in 10-30 minutes it should collect at the leak point.

Then you patch it.

Plumbing leaks should be easier to find unless you have buried pipes. Look for drips.