You'll have to back up what you need manually to a USB stick, install GrapheneOS (web install, super easy), choose your method to Obtain apps (PlayStore, Aurora, GitHub/ Obtainium) then copy what you need over.

I'd suggest keeping it simple don't install apps you don't need try get by using Vanadium (GrapheneOS's browser) where possible.

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I tried the USB stick but it doesn't seem the phone is letting me pick which device operates so I can then transfer files from it. :/

I'm not sure I know what you mean? Does the USB stick not show up in the file manager?