SITE UPDATE: 3 May 2020
SITE UPDATE: 3 May 2020
I hope I don't come across a bit of a knob when I say this but I feel your really taking the wrong approach if your wanting to try and take the social media crowd.
The big reason why most people choose social media is it's one feed instead of lots of little feeds which are split all over the place and it's way that newer forums are going too as it's just easier to use. The design you've chosen here is the total opposite and fragments it badly with the images etc which is a waste of space. The most important part the last post info is tiny at the bottom and it's cut off as it's capped on one line.
For an example of a modern forum check out https://forums.gearsofwar.com/ it's all one page with the option of splitting it up into seperate categories if you want but it's purely a feed and that's what people want to see. They also use tags which is another way to get seperate topics out so you can further split thread types up. Reddit is another example of a good forum design (it's what it is really) and is something which killed many forums off in many other subjects which is similar but doesn't have forums at all and only uses tags. I'm not sure what's possible with MyBB though as I've never used it.
I won't be all negative though and say I'm glad you've finally decided to split the forum threads up as the latest discussion together didn't really work as it was too many discussions bouncing over the top of each other.
