Google Has Removed Manifest V2 Extensions From the Chrome Web Store, Including uBlock Origin
webiterate.dev
Google today reached the final milestone in a browser-extension transition that has been years in the making, all remaining Manifest V2 extensions were removed from the Chrome Web Store.

Brave will continue to support it, but the best move is to switch to a Firefox-based browser, either Firefox itself, Waterfox or Zen Browser.