Niche - I don't really see a niche for your site. Maybe General Discussion? It's not that clear.
Forumotion - Forumotion is a great platform to build a forum on! I've used it myself and I have the control it gives you. However, if you're serious about your forum, you should get paid hosting and a domain.
Design - The theme is okay, but has a bit too much black. Try to add some different colors. Also, your logo is from a logo generator and isn't custom. That's fine for a small form, but try to get a custom one done from a service like Fiverr for $5 or someone here on FP. (Even myself!)
Activity - Looks like you have very good amount of topics and posts for a small forum like yours. But most are in the archive, so not much recent activity. You have 10 active members in the last few days, that's a wonderful start.
You get a C! 70/100
You have some improvement to do, but I'm sure you can do it! Good luck with your website
Cheers,
ddoesmc 😉