I’ve done my bit to improve the boards, I left! 
But seriously, I do have a couple of points, some of which relate to why I left. These are all about the messageboard side - I’ll leave the moichendizing and Patreon suggestions to others :
1.) The Ads. It’s been mentioned a dozen times here, but the SDMB’s ad partner serves up viruses and malware like burgers at a McDonald’s. I wouldn’t mind whitelisting the site if I could trust the ads, but right now, I can’t.
2.) The moderation. I think the few moderators I viewed as hopeless are gone now, but even the good ones that are left are working from a set of rules that seem wildly varying according to mood, phase of the moon, what have you. I would suggest fewer, clearer rules. Don’t Be a Jerk is still a fine guiding principle, but maybe ease off the ‘Here are the twenty circumstances under which you are not allowed to say ‘fuck’’ stuff.
3.) The interface - It’s not bad, exactly. It looks like dozens of other sites on the internet. Which raises the question, “why come here?” It’s probably due for a spruce up or overhaul.
4.) The mission statement - This one’s tricky. The board’s diversity of topics is a good thing, but it also leads to the problem of “jack of all trades, master of none”. If I want to discuss comic books, or RPGs, or classic movies - I have other dedicated forums that will give me more viewpoints, more information. General Questions is sort of the central forum here, and everything else is just a bunch of us nerds chatting with each other, and General Questions is, in some ways, mooted by Google’s existence. Still, there could be a ‘market’ there.
So my idea would be to subdivide the forums. General Questions would be a container, under which there would be subforums about different topics. Science, Technology, History, Law, etc. Make it a place where a random schlub from the internet can come and talk to whatever experts we have on hand. And make it clear to the board users that they need to be on their best behavior there, because that’s where you get people in the door.
The other forums could be placed into containers as well - About This Messageboard and Comments on Cecil’s Columns could be a unit of some kind, and the rest could be categorized, or not. The model I’m suggesting is in use by RPGNet’s forums, which I still frequent. They have 2/3rds the membership of this site, but over three times the active members. It may be worth looking at them to see how they do that.