I don't know if you can roll back to Windows 7, and to change operating systems is a complicated process unless you buy a new PC. You might do well with a Chrome computer but there are not any decent computer deals out right now because so many people had to switch to work and school online. Search for "Windows Classic Desktop." You may be able to install a program that makes Windows 10 appear and behave more like the older version.
As for browsing the web, I use Brave. It is a variation of Chrome browser. It automatically blocks a lot of annoying advertisements and animation unless you choose to allow it on a per-site basis.