If you’re not sure what belongs in a navigation bar or whether a certain feature belongs in a certain place on the homepage, you can test it.
First create a list of the options. What could theoretically go in that position. It’s fine to have disagreements internally at this stage.
Second, use a platform like Optimizely to split test your options and see what gets the most clicks.
Or, if you can’t do that, simply test each option each month and see what gets the most clicks (relative to the volume of traffic each month).
Running 5 to 7 of these tiny tests each month can have a big impact upon the community.
Also consider how you name each area in the navigation bar. Changing the label from Forums, to Questions, to Topics etc…can have a surprisingly big impact.
Run a few tests and see what happens.