- there are ways to expand your communication and presentation skills without moving back to entry-level or taking a huge pay cut
- there is no way to know if your current plan will actually help you develop the skills that you want
- having an entry-level job with low pay is a much more diffiuclt position to work on your startup from (compared to being a software engineer with some additional soft/business skills)
- you'll be taking on a job that you admit you currently aren't comfortable doing
- it's possible that you're using this career move as an excuse to not work on your own starup right now because you're telling yourself that you don't have the skills. (this is high-level procrastination)
I understand that the slight level of absurdity and the risk involved in your plan can actually look appealling to a certain type of personality (especially if you're bored right now) but overall this looks like you're driving your career into the ground with very little potential upside.