The blog is avaiable to anyone. You dont need an account here. Anyway, i would do this with a 3cx partner to have someone avaiable in my region to get support or any other help.
First of all, you should urgently update the PBX! Unbind the old FQDN from the license, obtain certificates, etc., and then reinstall the system and restore it using the modified backup.
I don't understand the problem. What do the inbound rules look like? If, for example, the business hours are 8 a.m. to 5 p.m. and a break is set for 1 p.m. to 2 p.m., the system follows those rules. You just have to configure them.