Mentorship is important, but you can get mentorship without taking a junior position. I have a very similar history in terms of starting my career as the only

Mentorship is important, but you can get mentorship without taking a junior position. I have a very similar history in terms of starting my career as the only developer in my first few jobs. When I finally joined a few (small!) teams in a row that a) included other seniors; b) used mature processes; and c) included code review on every pull request, I caught up very quickly. A capable manager or VPE/CTO who's committed to helping their reports grow is also invaluable to a senior developer. And yes, it sounds like you may need to work on your interview technique.