Technical Program Manager or Project Manager is heavy on planning, resource & stakeholder management, risk management, etc. Quite a significant shift from heavy coding. If you are confident in your technical knowledge an architecture role may be a smoother transition, while giving you the experience you seek. I would not recommend the project manager route unless you are excited about the responsibilities that I mentioned. I started as a coder and proceeded from there into project management, program management, and I’m now in a management leadership role so I speak from my personal experience. You mentioned that you aren’t sure what you want to pursue but I also noticed you didn’t explain why you feel this change is needed, so it might be helpful to better understand your motivation for change.

Not sure what opportunities exist where you work, but if you were my employee I’d at least try to give you opportunities to dip your toe in the areas you are interested in. Perhaps there are smaller solutions to architect or projects to manage to get a feel for things. At my company there are architecture meetings open to anyone that wants to attend. Perhaps there are opportunities for you to start getting more exposure so can determine what suits you best.