I think there's two things people call writer's block
The thing I most often hear called writer's block is lack of inspiration. The insight I've heard into that is that... that's the normal state. The more writing is a casual hobby, the more you can just work on the project you feel like when you feel like it. You can wait for inspiration. Once you have a deadline, that doesn't work anymore. I think that's where some people find the 'just write' advice helpful. Sometimes you need to stop waiting for inspiration, and learn to grind through the scene.
Personally, if I'm bored with what I'm writing, I skip to something that does interest me. It gets me moving again, and often I'll realize the scene that was boring me.... is boring, and find another route to get to the good part.
Second, writer's block can be a symptom of a bigger problem. Burnout (spending too much time writing, fatigue, and depression can all be labeled as 'writer's block', but you can't push through them. If you're too exhausted, miserable, or isolated to write, the solution is rest, caring for your mental health, or getting out of the house, not writing harder. It turned out what I thought was "writer's block" was actually mental fog from a circulation issue.
It sounds like what you're having is... anxiety. Not feeling stuck on the next scene, but a general concern with not being good enough. The thing that's helped me most through anxiety is this "every first draft is perfect because all a first draft has to do is exist". Focus on getting it down, tell yourself you'll edit it later, and when you still hate it after trying to edit, push publish.