My account is blocked , so I can't make any question anymore. Is there any chance to be unblocked or I just should open a new account ?
Rather than trying to evade the block, you should consider why you're blocked. The automated post bans start after you create too many poorly-received questions, i.e. questions that are off-topic or not fit for the Q&A format. Deleted questions count, and count heavily against you.
I noticed that you don't have the Informed badge, so I will direct you to the tour. Please also look at How do I ask a good question? and What topics can I ask about here?, both from the help center, which would be good to look through.
You can save yourself by editing your existing questions into shape, polishing up their presentiation (formatting and grammar). If you can find your now-deleted questions - there should be a link somewhere in your profile, visible only to you and moderators - undelete them if possible (doable only if you deleted them yourself) and improve them.
Opening a new account will not help. The system is smart enough to know when someone's trying to avoid a post ban.