Hi Hiba,
If you apply online and are not successful, you won’t be able to apply online again for the duration of the ban (usually 12-24 months)
The only way to receive an invitation again during the ban is to use a strong referral (eg partner level), although there is no guarantee that it will work. Some people also try to cheat the system changing emails/names in the application, however, this also doesn’t always work.
If you apply via referral without an online application, your name may not be recorded. If that’s the case, you may be able to apply again during the ban period for a different office.
If you need help with referrals, I wrote a post with the exact steps to follow below:
https://www.preplounge.com/en/consulting-forum/hey-everyonehope-all-is-well-3176
In case you need additional help, please feel free to PM me, I offer a class exactly on that.
Best,
Francesco