You didn't tend to do many F1s when you were an admin before (about 10 - 20 per week at most), and I (personally) haven't seen any F1s from you in-game to report rulebreakers, so I think you should go for mod first to prove dedication to staffing again.
You're a lad though.

When I was last staff I did roughly 20-25 F1s a week as staff and this number dropped I the weeks before my resignation.I know this number isn't high, but I am willing to drive that number a lot higher. In terms of you not seeing me actively report it may be due to the fact you got mod a few days ago and have not been on at the same time as me, but the staff I play with will support me in saying I report players actively during our RP - either via the F1 system or telling them via TS