In my experience, your ISP will only give you a new IP address if your modem disconnects for a while. You can easily use the same IP address for over a year.
You can also use something like DuckDNS to have a backup in case you are away from home and your IP changes, you can still find your server. You could even theoretically write a script that then checks DuckDNS for your IP and updates the record with your Domain Registrar automatically (assuming they have an API)
You can also use something like DuckDNS to have a backup in case you are away from home and your IP changes, you can still find your server. You could even theoretically write a script that then checks DuckDNS for your IP and updates the record with your Domain Registrar automatically (assuming they have an API)