I find having a dynamic IP address useful but I use a lot of other OPSEC schemes (not just using encrypted VPN). Isolating online activities is also crucial to having good OPSEC (such as having numerous isolated web browsers, each used for different online activities). I also use a second isolated computer just for email and legit stuff like online shopping. Even if that computer got hacked, it is in no way associated to my other computer I use to shitpost on sites like this, or identified to my political beliefs or any file sharing services. Compartmentalization is key to operational security and privacy. Computers are a double edged sword, they can be used to your advantage but also to the advantage of your adversaries if you are not extremely cautious and careful.

Also, it helps to learn about firefox  "about:config"  to help fortify your web browser from adversaries and hackers. There are a lot of options out there as far as firefox forks as well privacy extensions. You can test your browser security here: https://browserleaks.com/