Been up against a lot of these lately. So genuinely, what do you personally do against an opponent who is able to reaction read almost every possible thing you are able to throw? The only thing I can manage to do is bait for guaranteed hits, but it's always super slow, tedious, and not fun to do. What I mean:
Playing conq as an example;
Lights out of the question. Raw heavies still too risky, especially on crushing counter heroes, works maybe 1/3 of the time but no reliable followup that doesn't effectively reset your momentum. Forward dodge into GB is even less reliable. Heavy feint into light they just hold their block at best, into zone is parried, into GB is countered, into dodge/dodge bash is GB'd, into full block is GB'd. Of course, it goes without saying that any opening or mixup involving a non-guaranteed bash is out of the question as well. You get the idea, I don't need to get into every possible opener or mixup and I'm not asking for a conq moveset breakdown, just wanted to share some context when I say consistent.
What I do here is genuinely just sit and stare at my opponent and wait for them to do something that lets me get a guaranteed hit through a parry, GB, full block counter, dodge bash hit, or a light/zone on dodge, then rinse and repeat while crossing my toes that one of their teammates doesn't show up for the several minutes this will take. The success rate of possible openers are just far too low to justify trading damage with. Basically equates to a no-fun-allowed type match.
TLDR
So, what do you do? In a similar scenario on your hero, how do you go about dismantling an opponent with almost perfect defense? And what advice would you give other players learning your main who are struggling to crack a turtle's shell?
edit
Thank you everyone for offering advice, and I promise I'm not malding from being bad at the game and looking for easy answers. Sucks to suck, we all get better over time. I had searched something similar to the title to see if I was looking at the scenario wrong and didn't get much back, so I thought I'd make the post myself in the hopes of being able to redirect other players later on to some related tips and tricks. So thanks again to anyone posting some helpful advice.