i think it depends. was your account suspended due to DMCA shutdown or was it due to inactivity for a period of time and was wiped clean?
i think you could try to contact Mega's customer service and repeal at least the shutdown of your account. but i don't think you can get the files back.
Ele diz que tem que fazer uma contra notificação em cima da que me foi mandada,é sobre os arquivos que eles marcaram infelizmente como não foi a 1 vez nas outras eles excluíram os arquivos eles suspenderam a conta toda
if this was not the first time DMCA removed copyrighted material from your account, its likely that you had enough strikes against you to permanently suspend your account. you'll have to make a new account under a new email. (i have like 12 different accounts so there won't be an issue regarding having a maximum number of accounts to your IP address.