3 weeks ago
Pretty much like WUG88 put it. The only ways to increase XP are either completing the quests in the games, or commenting, either on the articles or on the forums. But as said before, commenting too much can lead to said comments being labeled as spam and deleted, which will also cause you to lose any gained XP.
However, if I remember correctly and that element hasn't changed over the years, XP builds up far faster from all sources, even from comments, if your level is lower than 3. Just keep going. It's the only real advice I can give.