Please help me find a reason for leaving my job - context in OP

[UserThenLotsOfNumbers]

I posted yesterday about my situation, however I have made this post to be a bit clearer.

In a nutshell I may have to leave my job without another job to go to. I need to find a good reason to put on application forms/say in interviews as to why I've left, that won't cause a problem for me finding another job.

I'm leaving due to my manager's awful behaviour, incompetence and bullying. Several other people have already left in the team for the same reasons (actually it's just me left so it's gotten worse). Some colleagues had jobs to go to and some didn't. Management support the manager and it won't get better, so not looking for advice in that respect.

I have worked for the company for 5 years, about a year in this particular role. I could get a general reference from work and a personal reference from another colleague, probably my previous entirely reasonable and nice line manager. No issues during my employment, I am good employee. No financial concerns. Temping is of course an option.

What can i put as a reason for leaving to justify my "career break" without putting the real reason and without damaging my chances of getting another job?

Thanks!

"I was no longer being stretched in the role and wanted to find a position more suited to my skills and aspirations. I felt uncomfortable doing this while still employed - that feels unethical to me. I decided it's time to leave and concentrate on making the right next move. I believe this job could be exactly what I'm looking for."

If you take the 3-6mo, you could have been pursuing a personal writing project / whatever your skill set is project. The timing of the opportunity was impossible to resist and it's now completed. The itch is scratched.

For your interview today, don’t say anything about restructure, management difficult, etc

Focus on how you want the move to develop your career and why you’re suited to it.

Better to make it positive - you’re right for the new role - than negative - you need to escape current job.

There’s no need to even allude to how bad the current job is. This could make the recruiter think you’re looking just to get away from it, not because you actually want new job.

My interview went well, they will get back to me hopefully by the end of tomorrow. Thanks for your support!
Oh no, didn't and wouldn't mention anything like that at interview.
It was more for if I got an interview at at external company and they asked.