Why don't you look at a co-working space? You wouldn't need to give up any equity, but you would get access to some of the social aspects you seem to be after. They're probably better than simply working in a public setting like a coffee shop since you'll be mixing with people doing similar things to yourself.

One thing I would say is that you are wise not to ignore your mental health. If you already know you are prone to depression when working alone, make sure you never have to.

Lastly, can you talk to anyone where you sourced the funding? Do they have any mentors etc? They might have some ideas.