'What do you do for work?'

So I get this question a lot, and I never know how to answer it.

I have a 'job' but I just work in my friends store for the social aspect and I find it fun.

My main source of income is my investments and assets. I live off of these comfortably. This is what I put my usual 9-5 time into.

Now how do I go about saying this. On one hand, I don't wanna see like a showoff, since I'm usually not very flashy and find it cringy. I don't want to say 'I work in a store', because no bitch wants a loser on minimum wage.

I want a quick and easy response I can just say every time, that's funny, and kinda the truth.

Any ideas?