In some countries there is Standard with a package to obtain the static IP address, but in some countires u need to pay additional $, Household users "clients" have dynamic ip adress, because dumb government made it + u need pay 2x more then the regular price of internet just for "STATIC IP", I do not know where you live but you should ask your providers or you can take a look on websites (provider ofc) of pricing for static IP address.
There is no way to turn on "STATIC IP" if u have dynamic ip addresses, all these tutorials on yt are FAKE.
There is one metod with hosting no-ip.com, they have application when your IP get changed the application automatically changes DNS ZONE IP from his databases. But this only works for hosting websites, dekaron server files does not understand DOMAIN, maybe if someone create special exe for domain that recognize the ip immediately the same moment.
Link to no ip:
There is one also site that offers a gateway: