Advice for a new grad? I will not promote.

I am about to graduate university and committed to dedicating the next 10-15 years towards making a successful company to either be acquired, IPO, or just continue working on growing the company to multi-billion dollar revenues. Unfortunately I have no job lined up so I may have to move back in with my parents until I find a relevant tech job to at least save some money. Financially I'm not too worried because I know that my parents could help me, but I also want to make my own money and not lose momentum after graduating college. I know the target industry that I want to build a company in, but don't have a specific problem that I'm solving. I am currently educating myself to understand key players, and how the industry works in order to find inefficiencies to find a niche to break into. My industry has a large total addressable market. I've also been applying to jobs at key players to hopefully break into this industry and learn about it from working on the inside. This allows me to gain access directly to the customers, strategy, and how to actually run a business in this industry. What advice do you have for a soon to be graduated computer science college student like me who has no job lined up and aspires to build a great company?