There are a few ways to renovate an old pool. One way is to resurface the pool with a new material. This can be done by sandblasting the surface of the pool and then applying a new coat of finish. Another option is to replace the entire pool shell with a new one. This is usually more expensive, but it can be worth it if the current pool shell is in bad shape. Another option is to replace the old plumbing and filters with new ones. This can be a bit more complicated, but it's often worth it in order to get better water quality and circulation. Finally, you can also re-tile the pool deck or add on new features like a waterfall or spa.

You could either renovate it or fill it in and start over. If you choose to renovate it, you'll need to remove the tile, clean the surface, and then put new tile down. You may also want to update the coping and/or the deck around the pool.