50 000 trades and no verification till now?
Localbitcoins is 5 years old, that would mean 10k transactions a year and 30 a day and this assuming he was there from the start.

From what I've heard from my favorites traders, at around ~10k euros the verification was triggered even in the past, I hit it in 2018 with only ~7000 euros but probably it must have been because of the fairly large chunks.


Nope, the first wave of KYC requirements for large volumes was put in place in April 2018.
Again I doubt you weren't flagged till now with the volume you claimed.

Anyhow, unfortunately, nobody here can help you here in this case, the only ones that can are LB's staff.

The same issue with them

This is completely a new issue, with localbitcoins verification happens without any error. What's been stated seems to be based on something wrong from your side, if not they'll not reply with such a statement of you cannot do trading further through localbitcoins. Also you've stated 50000+ deals have been finished by your. Even without verification how is that possible through localbitcoins.

There is nothing anyone on this forum can do to help you. Your documents have, for one reason or another, been flagged as being fake. Only you will know whether or not the document you submitted is real, or if you were trying to fool their system. If the document is real, and you think it was flagged by mistake, then your only hope of having your account unlocked is their support team. In the first instance, I would suggest responding to their emailing explaining that you believe their system has made a mistake, and asking what further steps they would like you to take of further verification you can undergo to solve this issue.

You can also contact them via the form on their website (here: https://localbitcoins.com/support/request/#other), or try reaching out to them on reddit (https://www.reddit.com/r/localbitcoins/) or the social media links provided at the bottom of their web pages.

Get over to LocalBitcoins.com and move on to https://hodlhodl.com, https://localethereum.com or https://local.bitcoin.com. All of these offer non-custodial wallet and do not require centralized KYC.

You have been blacklisted by localbitcoins for allegedly submitting a fake document. Did you really submit a legit drivers license? I don't think this is a simple mistake, the support team used a strong word (fabricated).

Be careful with people offering you help to solve this other than the official localbitcoins channel.

Send me a pm with your telegram and we are going to solve it in a way or another.

Contact their support, they will solve the issue

If that is the case, then you can inform them that according to their own blog/website (https://onfido.com/supported-documents/), passport is also allowed. I am assuming that the localbitcoins/onfido support made a mistake when you said they only allow driving license.

Are you from this region where only driver's license is required?

If so, then you either have to get a real one or convince them that what you submitted is legit and valid. 
If not, then you can check that link and see other options in your area.

Have you tried asking them why did it get rejected? You could try to submit another document, like an ID card or passport.