im unable to renew certificates because in few time lets encrypt generated to much certificates to my server i think the problem started when started to issuing R3 ceritificates.
Anyone can help?
You have renewed your certificates. That part has worked.
That's the problem: Why do you create so much certificates? Create one, then use it 60 - 85 days instead of creating the next and the next. That's a waste of resources.
So please describe your exact problem.
PS: And there https://excitasy.bystart.com/en/ is a valid certificate. From SSL Corporation, not from Letsencrypt. Why do you want to create certificates?
If you have a problem with the SSL Corporation certificate, ask there.