Once you have a clean Mavericks .dmg :
Some older professional software suites (like older versions of Adobe Creative Suite or Pro Tools) run most stably on 10.9. How to Get the 10.9 Mavericks Image
– if you rely on modern apps (Slack, Zoom, latest Adobe CC). Even a 2012 Mac mini will run macOS Catalina or Monterey via the OpenCore Legacy Patcher far better.
Disclaimer: Links to direct ISO/DMG downloads are omitted intentionally. Respect copyrights and only acquire software legally.
If you previously "purchased" (downloaded) Mavericks when it was current, you can often find it in your App Store history.
Open Terminal and paste the following command: sudo /Applications/Install\ OS\ X\ Mavericks.app/Contents/Resources/createinstallmedia --volume /Volumes/Untitled --applicationpath /Applications/Install\ OS\ X\ Mavericks.app Enter your password and wait for the process to finish. System Requirements for Mavericks