Try many different kinds of scratching posts - some cats like upright, some like flat.
Similar to Dizbelle, I once gave up & designated a "cat clawing chair".

It was an antique side chair with seat/back upholstered in a burlap type fabric.
Leather furniture didn't work for me, had one cat that ambushed it (and I'd re-upholstered the burlap chair - stupid
me!!). I used Soft Paws on her and while she didn't
enjoy the process, she tolerated it without bloodshed on my part. Vet did it once, and I took over from there.
Later on...new cat, new husband...we acquired the little devil in my avatar (named Rocko, should have been named Damian!) Rocko DETESTED being restrained or having his paws held. He'd become a whirling dervish. My experienced "claw-trimming" DH couldn't do it, even the vet's office had to sedate him to trim his claws. Obviously, Soft Paws weren't an option either.
Rocko would catch his claws in the carpeting while running full speed and we were afraid he'd dislocate a leg or something. Having never declawed a cat before, we reluctantly decided on a laser declaw and it went well. No bandages. Picked him up at the vet the next morning and he was climbing the cage. Within a few days he was pretty much back to bouncing off the walls and leaping onto our shoulders.
We'd also adopted his great-grandma (a retired breeder) who was none the worse for her earlier front declaw. Neither became biters or were less than pristine in their litter habits.
If all the above fails, and it's legal in your state, I wouldn't hesitate to find a qualified vet who specializes in laser declaws.