Blocked access to the site from the network of my provider?

Problem accessing from my ISP’s network.
I get A-records for the site via DNS 300 IN A 300 IN A
These IP addresses respond to ping
PING ( 56 (84) bytes of data.
64 bytes from icmp_seq = 1 ttl = 59 time = 29.3 ms
64 bytes from icmp_seq = 2 ttl = 59 time = 29.4 ms
But when you try to connect to port 80/443, the packets go away, but there is no response.
Maybe the network ( of my provider is blocked on the cloudflare server?
The site opens normally through mobile providers.
What can be done in this case?
Thanks for any help.

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