A VPN can give you a new IP every day, or every few hours which can help.

In a mobile world, IP of a given device can vary for so many different reasons that it is simply not a practical, reliable data point for long term tracking.

Otherwise, fingerprinting probably wouldn't exist.

The fact that any number of people might be behind a NAT or gateway also makes an IP addresses unreliable for tracking individuals. It doesn't stop people from trying though.