Check your pinterest account shadow ban. Pinterest Shadow Ban Checker
What is Pinterest Shadow Ban?
Accounts with excessive spam are applied a shadow ban. It usually occurs due to multiple accounts or very frequent pinning over a single string.
Pinterest treats your actions as spam and does not show the content you share from that account to users.
We'll pin up your followers and your page profile, and your account will be used actively. However, it does not appear in any way in search results, tags and discover parts. In this case, your account will not make any progress.