Leaving promising startup situation for Tier 1 IBD Off-Cycle

Hi Everyone,

So I've been having some sleepless nights lately.

After having finished my IB summer internship, I decided to go back to my home country during covid to finish my dissertation and apply for an Off-Cycle.

After getting home I was contacted by a wealthy family friend to trade some of his money (a few M) and get a carried in return, this is going quite well.

Next to that i started creating a SaaS app with 2 friends that I trade with. The app looks very promising, works perfectly and is launching soon.

Moreover I am helping out with another friend's startup and received 10% equity in return, we are currently raising VC capital.

Taking all that aside, I just received an offer to start an Off-Cycle by Jan 2021 at a top EB back in London. 
My parents want me to take the IB offer but I am scared that I will have to let go of every thing that i've worked for over the last months without being able to return to it. Nevertheless, getting into IB is everything that I have been working for over the last years and I am scared that if I don't join again now, I won't be able to return to it. 
I always told myself to do IB for a couple of years for the experience and afterwards get out to start my own startup (as that is what I really enjoy the most): current opportunities are tempting me to shift the timeline. 

Some advice would be higly appreciated, thanks guys (and girls)!