Ask HN: What to do with an old Watchguard XTM 525

I received a Watchguard XTM 525 and now I wonder what I can do with it.

I'd like to use it at home. Do you have any suggestions for what to do? My experience with firewalls is low, as I am at the beginning of my career. Though I thought I could do a little work with it. You understand me - I am looking forward to your suggestions :)

Maybe something Mr.Robot style?!

Greetings :)