Looking at your post history, you are losing XP for spamming. You will lose XP when your posts are marked as spam or deleted (this includes if a thread you posted in was deleted).
Also to note, you can only gain xp for about 5 comments per day, so commenting more than that only gives you more opportunities to lose xp, so best to keep your comments around that amount to avoid xp loss.
you can also complete tasks. Many tasks gives 100 exp its highly recommended!
Keep in mind that you shouldn't spamming.
Spam comments will be removed and you will lose XP.
you gain xp. as for how I got to level by commenting
in 3 steps
Choose the game that interests you and play itfor free.
Every game has some quests for which you will receive Soul Gems.
You can exchange your Soul Gems for Steam Wallet top-ups, game keys, CS:GO Skins and other rewards.
You know that on Gamehag you can get real rewards for free, right? Join us, complete walkthrough and get your chest!
whenever I comment on a forum now, I lose xp. idk what I'm supposed to do