Agreed!!
3rd option - 5 yrs already within industry and within startup ecosystem, these 5 yrs are like goldmine according to me, you can start on your own.
You have the industry exposure, you can address the business gap evidently, you are surrounded by enough jenious minds within the startup ecosystem and you can team up with them to address the business gap.
Sound's too naive but working with startups is where real growth at individual level takes place - new perspectives and new mindset builds!
Go with the 3rd option - Startup