[ximeng]

It sounds like if you were to stay on as CTO you should consider delegating some more of the management, not just the tech. Who in your team can step up to support you? A CTO with 20+ people should be doing low-touch development if at all.

No harm to step down or out for a bit and come back to it when you're ready if you're burned out. Rotating the management and developer duties might reduce your pressure if it makes you feel you've got more back up.

Consider pair programming if you're doubting yourself, maybe with both weaker and stronger developers to help benchmark your skills more accurately.

External training or mentorship might help you to get another perspective on your skillset.

Also consider whether there are any external factors such as your upstream management, clients, or the market that you are in that are stressing you out. It may be that the worries about development skills are symptoms of another issue.

As a senior team member, you should have a lot of scope to choose the work that you think is the best fit for you. Taking some time to think about this is part of being a manager, and as a senior developer your development skills are not something you need to worry about too much - you can bring these up quickly if you need to, and you probably don't need to right now. You've gone through a stage of worrying about what you can bring technically to the table, and that's not your focus right now, which feels uncomfortable. It's OK to follow the flow of your career and see what happens, you can reset down the line if needed.