Linux for 2013 Trashcan Mac?

I recently purchased a Mac Studio to replace my ancient Trashcan Mac (work in post audio, it's a Pro Tools world, so no Linux options unfortunately).

The Trashcan has basically no resale value, and is already capped out on OS updates.

Specs are:

-10 core E5 Xenon (I forget the clock speed, and it's unplugged atm)

-64GB ram

-512GB SSD (NVMe PCIe 3.1 x4)

-Dual D500 (whatever that is) graphics card(s)

https://www.apple.com/ae/mac-pro-2013/specs/

My thought is to repurpose it either as a hardware firewall since it has two enet ports, or NAS - ideally running headless, and would be able to be admin'd by the other Macs in the house.

My last Linux experience was Gentoo in 2004, and Slackware before that. I'm not afraid of CLI, but it's been 20 years, so what little I remember is probably completely outmoded in 2023.

Any advice for distros that would work for this use case?

Thanks!