If you want Google apps like Play Services but still value privacy, a common compromise is using microG instead of full GApps, as it provides basic Google functionality with more control. Installing GApps via Magisk (as a systemless module) is possible but tricky, especially on an already set-up Lineage OS system—it’s generally easier to flash GApps right after installing Lineage OS. Since your system is already configured with Aurora and F-Droid, to install Magisk and GApps now, you'd likely need to reflash Lineage OS, then install Magisk, and then use a GApps module for Magisk (like NikGApps
