Business to start with 50k

I’m an experienced product manager and come from a business family and from last few months have been trying to find a better company to work with and learn. But for now I’m really willing to start something of my own. Please suggest something to start with. Ps: I meant for a side business to begin with INR 50k and not $50k(as assumed by all of you). Because I really like doing Product management in startups so will continuing doing the job but in a good company as recently I’ve left the company because of its extremely arrogant and toxic work culture.