HELP! Curls won’t come back!

I have 4C hair and stopped getting a relaxer over two years ago after having one for most of my life. During the transitional phase I straightened my hair about every two weeks, but I recently decided that I wanted to completely stop using heat and just transition without it. This week was the week I was going to start but, unfortunately today when I washed my hair, I couldn’t see a clear demarcation line from where the curls end to where the straight/relaxed pieces begin. The “best” definition in my curls was in the back, but the front just looked puffy without any definition whatsoever except a bit at the roots. I’m afraid I’ve permanently ruined my curls and won’t be able to get them back without chopping all my hair off. TLDR: My 4C curls won’t come back after straightening my hair during a 2 year transition from a relaxer.