I have Redis installed via Homebrew and running as a brew service with no issues. I have Homebrew install 7.2.5 working without issue as well. However, if you were relying on PECL prior to the Homebrew changes, you will have issues since it is not included any longer. I am using the most current version of Valet as well.
Try this brew install homebrew/core/php because the other install were deprecated.