I'm quite wary of getting stuck to any specific game (I mean, it's kind of already happened), but I think the 4 of us will stick with Zomboid for a while. We've all enjoyed it, and it has that real sandbox potential for us to do a lot of cool projects in it. I know I have ideas
As to a solo playthough - I'd be up for something like that, but I'm not sure I'll get around to it. I have a list as long as my arm of requested series and games I want to play, so it doesn't make a lot of sense for me to have two Zomboid series at once! It's definitely not off the table, especially if we end the multiplayer series. But for now, we have a whole new series ahead of us!
I enjoy not knowing everything in Zomboid. It's less fun when playthoughs are too perfect, strategies are too optimal. I used to play games like that and it was just tiring making everything perfect. I like the sort of organic chaos that you get in games from rolling with mistakes, planning as you play and not before, but I'm getting a bit rambley here. I'll probably take a break from Zomboid when I start to know it too well. Back in the old days, before Steam, I played Zomboid to death, and as a result I knew everything, and I got bored. It's taken me a long time to feel ready to come back to it. I really don't want to burn myself out again, so I'm going to limit my playing to keep it fresh. That way there will be more Zomboid on my channel in the long run!
Now look, I've gone and rambled more than you! Your reply was clearly not too long