@OP, you could get a ban if you keep posting spam on this forum (especially when you are wearing paid signature to fill your weekly qouta), as @hilariousandco said on this thread
https://bitcointalk.org/index.php?topic=1684035.0First offence: 7 days
Second offence: 14 days
Third offence: 30 days
Fourth: Permanent ban
If you have received the fourth ban, it's mean you must leave this forum forever since you have got a permanent ban.
that's mean I need to avoid signature campaign right?
You have got it wrong. Just read & follow the rules on this forum and you will be fine. You must understand how the signature campaign works first before you decided to apply (when you rank up, not now)