Bite the bullet & replace 1/2 the water with a submersible pump. Don’t drain below the ground level surrounding the pool since it’s buried.
The no drain water exchange (draining & filling simultaneously) is the very best option, won’t risk the pool or your equipment & won’t flood the street.
Section 3.5
www.troublefreepool.com
The cya is not your only problem. With all the potions you mentioned you used previously it is likely that you have added metals(copper) to your water that have built up & are now showing themselves at adequate fc levels (which you likely never reached in the past).
The tfp way is not a series of bandaids like your previous methods were. They often reveal the true condition. The copper in the potions kept you from going green at low & unsanitary fc levels but at adequate fc levels the result can be clear yet green water, Green hair, fingernails & stains.
www.google.com
A 50% water exchange would put things right at a very low cost. It’s not complicated.