I don’t think you should call it quits just yet. Or at the very least, you could just try branching your work onto one of the writing platforms that doesn’t mind cross-posting.
If you’re not able to sign in to Medium, I’m a little confused how you were able to get this post up. Are you only signed in through mobile?
Additionally some advice I got awhile back that was helpful for me was to remember that Medium is a platform of writers more than it is a platform of readers. I was hardly making anything before one of my posts finally got picked up for a boost. I definitely think you have what it takes for your account to start taking off, it’s just a matter of consistency and continuing to push out content sometimes.
Hope you can decide to stay!