"Senior Developer" is a heavily diluted term at this point. You can generally only count on it meaning 3 years experience. It's effectively code for "did not wash out".
The problem here seems to be that you are in fact a Lead Engineer, not a Senior Engineer, which does have some pretty hefty expectations associated with it. You feel like the blind leading the blind.
If you want to go back to being 'just' a Senior engineer, then you need to do what the rest of us do when we are objectively or subjectively good at something that makes us uncomfortable or unhappy.
You lie by omission.
Downplay the leadership responsibilities of your position on your resume, so you look like someone who can be groomed into a lead role instead of expected to do it from Day 1. You'll get to backfill some of your experience along the way into that role, or they'll leave you alone.