Hi @Mikko11 I hope you are well!
Indeed the function to connect hosts looking for local co-hosts has been closed- the reason seeming to be that Airbnb prefer hosts to use the large management companies they have partnered with and advertise on the "host assist" section of the platform.
Some hosts will put a post on here searching for a co-host (you must be careful, as "advertising" on the CC platform isn't allowed) some use Facebook and other online groups to search as well.
You should have a Local section of the CC, you could see if there are any posts on that section that could be useful from hosts in your area- but I know you operate from another country, so that might be less helpful!
Certainly contacting hosts cold through their listings wouldn't be the best use of your time as you have no idea if any of them would be open to co-hosting.
Best wishes
Paul 🙂