I've been using VPN's for about 25 years.
Mullvad has been consistently good for ease of use, uptime, and customer service. I don't always use it, but I always have it installed on my computer, ready to go.
However, some years ago, I started getting a few error massages from web sites, "We have detected that you are using a VPN. That is not allowed on this web site." So I decided to spin up my own, personal, totally private VPN. For that I used Digital Ocean. They have VPN software ready to use ... minimal setup required. Speed and uptime excellent. Customer service non-existent. Price at that time, only US$5/month. With one additional huge benefit: You can change the IP whenever you wish, at no cost. Change to random IP within the Digital Ocean array. That was my plan, to thwart web sites that had started sniffing VPNs. But I never actually did any IP change.
About a year ago I started using Proton mail. Even their free mail accounts offer access to a free VPN. After testing for several months, I paid for their premium service. Very pleased, so far. The VPN speeds are fast and up-time is excellent. Proton offers more portals than Mullvad. The only way Proton is lacking is customer service. It's not terrible, but it comes from anodyne young females who write in "customer service talk." Quite a contrast to Mullvad, where customer service is stunningly fast, concise, and helpful.
There is one other option to consider: "Brave" browser offers TOR build in, free, and no setup required. However, like any TOR connection, is is slow and probably NOT 100% anonymous.