To build on the comments Brad, Trace, and Jason, here are a few ideas --

WPTavern has already established itself as a highly regarded resource of WP news and conversation. You should build on the very strong credibility you already have. Expand the blog and topics. Hire guest writers and publish even more articles than you already do. More topics. Tutorials. In-depth news/interviews.

As for increasing audio ad sales on the podcasts - Check out mixergy.com. Andrew Warner does a fantastic job of plugging his sponsors at the top of every show, and his approach clearly pays off. I might even suggest switching to a video podcast or video interviews. Could bring the show to the next level (and boost monetization).

I think paid forum areas are a good idea. Definitely a paid job board. FreelanceSwitch does a great job of this by charging $7/month to apply for jobs, but posting jobs are free. This helps to weed out the non-serious applicants while keeping a steady flow of new jobs.

This wouldn't be in my best interest, as a premium theme company owner, but I'd consider doing paid reviews of premium WP products. You mentioned you receive loads of requests for reviews. I see nothing wrong with charging for this product promotion. You'd have to disclose the fact that it's a paid review of course.

Lastly, I wouldn't underestimate your abilities as a consultant. You're clearly very knowledgeable about WordPress and web development in general. You can certainly build a freelance business on that, even if it involves project managing WordPress projects / over-seeing contractors, etc.