Hey Shantal,
Sorry, just tidying up my inbox, and had saved your question.
“commercial Directors ,freelancers, specially focused on tech commercials, like camera, washing machines, phones, tvs, etc ads.”
I think that you answered your own question, as in that freelancers can not be freelancers if they are only working (affiliated) with one company.
What you need to consider is the market that you are making commercials for?
What budgets there are for the commercials?
There is a big difference between making “product” videos for Social Media, and that of cinematic adverts for Cinema, Broadcast and Streamers.
A good place to start would be online directories, the kind that you would pay £200+ for the print version of, before the internet became a thing.
One example of a list:
https://www.productionhub.com/directory/profiles/commercial-directors/intl/germany
Sometimes, if you see an advert that you really like, you could phone the company and ask who the director was?
You could also cast your web wider and look at East Belgium, Austria, Switzerland and further away.
Hope this helps?
Atb
Mads