What I did was I installed one of these skimmers

https://www.amazon.com/HydroTools-Swimline-Mouth-Thru-Wall-Skimmer/dp/B0032JSQES/ref=mp_s_a_1_42?crid=1P5SG6WUUD7Q4&keywords=pool%2Bskimmer&qid=1685852461&sprefix=pool%2Bskim%2Caps%2C496&sr=8-42&th=1&psc=1

Then the big hole that your current skimmer is attached to gets replaced with the outlet jet. You can then plug the two smaller holes or add a solar heater through them.