@reloader-1
Some more reflection, and I reviewed a couple other forums I frequent that have been active for a couple decades:
One main Axis & Allies forum for everything. Yes, it can sometimes cause a bit of clutter, but in general it works extremely well. The experienced Anniversary player can answer the random Guadalcanal question, the newbie can discuss sculpts in 1940 with the collector of 1984 2nd edition etc.
A very very limited amount of subforums. They should focus on removing the large amount of posts that do not belong in #1, such as Triple A/online games, A&A variants, etc. Keep this number minimal (less than 5).
Perhaps (to be explored, because it kills traffic to #1) a temporary sub forum for the latest title (I.e. Axis & Allies North Africa). Segregates the majority of new content, but reduces overall traffic in the main forum. Important to merge this into the main forum after a few months, in any case!
KILL THE STICKIES. A max of 1-2 stickies at the top of a forum, they must be new. Right now on some forums you have stickied topics from 5+ years back…