Abandon profitable one man company?

Hi. I have since about 5 years been running a self funded B2B SaaS, with around $150k ARR. With marginal costs, it gives an ok income. I have done all the development and sales myself - not because I like to work by myself, it's just that I haven't had a need for assistance so far.

However, I feel the market (quite niche product) is being a bit saturated and I have quite a few competitors as well which are much larger in terms of team size. Still, huge corporations choose my solution because they like it more.

Some Fortune 500 companies run it on a daily basis.

The thing is, I miss colleagues and I have lost a bit of my motivation and drive since I have come to the understanding that it won't grow much more.

That's also why I do not want to take more people on board.

I'm thinking about just quitting and doing something else or maybe joining a corporate instead (basically just to get some colleagues). Also the feeling of working for something together as a team - and the feeling of being needed. I have outside of work a social life with family and friends, but as soon as I am working I feel a bit lonely. Working in a coworking space is nice, but the problems I face now and then at work are still my own so to speak.

I do not expect an answer because I guess only me knows what I want, just wanted to see if others have been in this situation?