I do not spam, the domain is okay, I make new posts I do not share the posts of others. If you are an expert, tell us how the pins are working for you and how I can fix the problem.
If you truly lost 99% of traffic overnight it's highly likely that your account/domain was caught up by their spambot. Meaning your pins are no longer ranking for keywords and/or will no longer appear in their distribution feed. Sometimes good-standing accounts get caught up in their spam filter so I suggest you contact Pinterest to review your account and explain the situation. Remember to always follow their best practices and guidelines to avoid getting pinged by their spambot
What works for me? I simply just pin 5-10 fresh pins daily to relevant boards. I never repin the same stuff within a 2 week period. And if you do repin make sure it's to another relevant board. I seo-optimize every pin and eventually they rank for their keywords within 1-2 months. Play the long game.... treat Pinterest like you would Google