I feel like the game is fine as it is by development.
It does not need to add more stuff, maps or anything, the game is already complete as it is now. Heck, there is a ton of fake weapon reskins that could be easily remvoed to improve the gun balance since right now there is too many to do anything working enough.
What the game really needs, and G1 always failed to achieve, was a good new player introduction, advertisement and, most importantly, cheater detection. Reduce the cheaters and improve the new players tutorial, and you will see the game at peak success again.
You are not bored from the lack of content. You really are bored from playing always with the same 15 hardtriers, rerolls and cheaters, with the occasional random ragequitting after two missions.