'Google unable to enable billing due to project limit however there are not any projects with billing enabled
As you can see in the picture below all of my projects have billing is disabled. However when I try to enable billing on one of the projects, I get Unable to enable billing popup due to You have reached the limit of projects on which you can enable billing. I cannot understand why this is happening because there is not a single project that has billing enabled.

Solution 1:[1]
Posting this Community Wiki for better visibility.
Re-enable billing on a project is well described in the GCP documentation, however in this issue OP got an error message that You have reached the limit of projects on which you can enable billing. In general, users should file a report to GCP to increase this quota, which is described here.
Main issue in this case is that all OP's projects were disabled and cannot re-enabled it in any project. This might be caused by reaching Free Account limits (90 days or 300$) or temporary card issues. Free accounts have some limitations in comparison to regular accounts. It's quite hard to determine it in Stackoverflow.
The best way would be to create an issue on Issue Tracker under the Billing component to have a deep investigation.
Solution
OP created a new Billing Account and linked projects to this new account.
I ended up creating a new billing account with the same bank card as the old billing account and linked the new billing account with no problem.
Sources
This article follows the attribution requirements of Stack Overflow and is licensed under CC BY-SA 3.0.
Source: Stack Overflow
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