I was in a similar place.
I didn't believe a single word of the religion for years but I carried on going for the 'association'.
Being a bit of a loner I had no social life outside the Witnesses, so was content to go along.
It took the blood transfusion issue with my wife to snap me out of it.
Next day finished.
I consider every JW that still attends even for the same reason that I did to be partly responsible for every death that results from the blood transfusion policy and partly responsible for every rape of a child that takes place under its security blanket.
I couldn't live with that anymore.
Every one that still attends has a ripple effect to ensure that others still attend even though they may not believe it anymore. Peer pressure.
If more unbelievers just left other unbelievers would just leave too.