I'll give you my thoughts...
First off, you need to have something that someone would want to come see. No offense, but your forum is kind of empty. Sites with thousands of links, usually have thousands of pages, or a few very, very, very good pages. One of my sites,
http://pdaphonehome.com, has a linkpop of over 100K, but that's because there are over 200K posts in the forum. I started that site from scratch and it takes a LOT of time to get to that point... and a bit of luck as well.
So first, get some content. If you only have a forum, then you need to enlist a half dozen people that will help you seed it with discussion. Otherwise no one is going to come. I would cut way down on the number of forum categories from what you have now, and then focus on one or two and really talk them to death. You can even create multiple usernames for you to talk to yourself, but this is very hard to do without messing up and having it destroy your credibility. Its much better to find a half dozen loyals to help. You then need to get new threads going each day... and make sure some people will respond with meaningful responses... not... "yep... agreed" kind of stuff. Don't move on to other forum categories until you have a good moderator in place for the ones you started with... then repeat the cycle. Its kind of like the guy spinning plates in the circus. You get a few started... then go to the next, but you have to keep coming back to the others to keep them going. If you can get moderators to sit on each plate and spin like crazy, you can get more plates going. If you try to spin 20 plates at one time, they'll all fall to the floor and crash.
As you build this up, then go find out how to optimize your forum software for search engines. Its different on each of them, but a forum dedicated to your forum software will surely be able to tell you how. It involves getting your meta tags straight, and sometimes adding archive hacks to create spider friendly content to get indexed. If you don't know which forum to go to, try
http://forumforum.com which does some level of dicsussion on all of them.
Once you have a base, then submit your site to Google for sure... and whoever else you feel is worthwhile. We do free submissions at
http://sitesubmitservice.com that are comparable to the higher end submissions... in exchange for a link.
After you get to this point, then you can start looking at your progress. It will take time to get your linkpop up... and it will jump in lumps as the spiders index...be patient and have "stamina" because it is a long haul. Go to MarketLeap's LinkPop tool and check where you are.
Then do some research on similar sites that are competitive with what you do. First go to look at their linkpop and drill in to where the links are coming from. Target that list for soliciting link exchanges. Prepare for a long grueling road for link exchange requests. It will take months of trying to get their attention and get them to exchange links. The challenge is to get sites that are similar, but not directly in competition with you. These are sites that would see value in linking with you, not a threat... or not a distraction and total waste of time to their users. BUT, make sure there is something there for them to see... a reason their users would value the link.
Get a niche, and market it like crazy to these guys. Remember that there is very little in it for them to link with you, but a lot in it for you.... so be willing to negotiate and take what you can get. Webmasters on popular sites are flooded with email, so your request will likely get overlooked for a while.
Get ideas from the other sites... both things TO do... filling a niche other sites aren't doing... and things to NOT do... maybe its already done so well somewhere else. Why do people want to come to your site? Keep asking that question over and over.
Then just keep working this cycle... build the content, promote the site... etc.
I found that publishing original reviews, news, commentary, etc... was very key. Then I found a group of friendly high-end sites to submit the news too. As it got published, it brought in traffic... and because the articles were in my forum, it was easy for people to comment.
This will take a long time to build, so be patient and stay your course.