How much do you want a pool? Pools do need to be re-plastered and pool equipment does fail over time. I would start with a decent power washing and take a look at the plaster and deck.

If the shell is good, it could last for another couple of decades with just a freshen up.

Can a pool with plaster be power washed? Do we use are regular power washer? We own this power washer.
https://www.costco.com/Powerstroke-3100PSI-Yamaha-Gas-Pressure-Washer-with-14-Surface-Cleaner-and-Turbo-Nozzle.product.100485851.html

It might be worth it if you enjoy having a pool, but that’s personal and subjective. What’s “worth it” to one, someone else might not feel the same about. The other thing is, I’m not sure you can just bury it. I believe you have to drill holes in the bottom first (for drainage) then the concrete needs to be broken up, then you can fill in. So it’s also a pretty costly endeavor, but likely not quite as costly as trying to revive it.

I agree this question is very subjective. Do you LOVE the idea of having a pool or are you indifferent? There will of course be ongoing maintenance costs beyond these repairs ... chemicals, covers, opening, closing, electric bill for running and heating it (which can be costly for a pool that size). if you’re not all in on the idea of having a pool then the $20k repair costs may not be a good investment.

That being said I love my pool and would HATE the idea of having that buried in my backyard!!

Around here the pool has to be removed, not just filled in other wise you will have a swamp. On the plus side it should reduce your property taxes.

Aside from the replastering, as long as there are no leaks, the pool equipment replacement is pretty trivial. New pump and filter, $1000 - $1500; a heater, if you must, $2000-$2500 (gas); diving board, $250 (if the base is good); Timer, $250. If you are handy and can replace these yourself, you can knock one third of those prices off.

Replastering is going to cost - $8,000-$12,000 - no getting around that. Acid wash it first and see if you can live with it.

We decided to try to power wash it first. The pool service companies stated the pool is pretty stained and acid washing will not take all stains out. We may just paint it and hope the plaster doesn’t peel off too quickly. We need new hydrostatic plugs and a new timer. I am hopeful that everything else works. We do not need a new heater.

"I would live with it now until you can afford a replaster"

Very wise words. Painting a pool is usually a lose-lose proposition.

Are these cracks within plaster of pool?

Almost certain they are cracks in the plaster.

They are shrinkage cracks. To determine if they are cracked through, tap lightly with a hammer on and around the area of the cracks. If you hear a hollow sound (you'll know it) it's probably not bonded to the substrate. It could possibly leak.

We have run across many pools with the same issue you have and they are not cracked through. I can only attribute it to age at this point based on your previous post and pics.

I just checked and I feel hollow raised spots on the bottom. I think about 3-4 small areas about 1 foot.

Also the cracks are only visible when it’s wet.

If it's hollow, then the plaster is not bonding. It probably never bonded adequately at the time. Is there a high water table on your property? Sometimes a high water table can prevent the plaster from not bonding right from the start. If the pool shell was not de-watered during construction, it can act as a wick and draw moisture through the shell and not allow the plaster to bond properly.

I had this condition on a pool reno 15 years ago. A super high water table required a pump running constantly to draw water from behind the shell. The entire floor of the pool was hollow and and ALL of the loose material had to be removed in order to re-plaster. It was a small indoor pool (14x28) so it was not so difficult. We've dealt though with much larger pools with the same condition.

Your pool may not ever leak at those areas unless they come loose.