You could switch to Firefox for Android, which has support for a limited number of Firefox extensions including Ublock Origin, with all of the desktop functionality.
If you really want to stick with a chromium based browser for some reason, you could try kiwi browser (chromium based browser for Android with chrome extension support) combined with Ublock Origin.
Ublock Origin has a few ways to do what you want. The most straightforward way is to click on the extension icon, click open dashboard, go to filter lists, scroll to annoyances, and try to enable some or all of those.
Ublock Origin also has a “nuclear” option called disabling JavaScript (extension icon -> JavaScript and reload), which happens to break video playback on just about every modern website :) .
For Roblox, there’s Sober. It works (IIRC) by putting the android version of Roblox in a container and passing the appropriate system calls to the Linux machine. It doesn’t need to worry about issues with Roblox’s Byfron anticheat since Byfron hasn’t been implemented there (yet).