I feel you. That’s not easy and you have every motive to be frustrated. Tech interviews nowdays are really strange, but also seems that you have burnout. Take a bit of therapy it helped me a lot
Somehow they feel more degrading than usual - I'm fully open about the fact that my ability to "write from memory" has atrophied and many engineers are just better than me. It's just wild that to get a half decent job I have to do things like implement json parsers from scratch in 20 min...