Is my move wise enough?

When does your flight go?

8:30 pm from Terminal 2

Just to be clear; you want to know if it’s wise to arrive in Frankfurt a day before your flight back home? Why wouldn’t that be wise?

Why do you think that's wise? I think I can manage to stay in my original location or go back to Frankfurt as the hotel is refundable, so if you were me, would you arrive in Frankfurt a day before the flight?

I’m sorry but I don’t understand what it is you’re asking. Do you not wish to arrive in Frankfurt a day before your flight?

It is never unwise to spend your final night close to the airport.
If you have no interest in visiting Frankfurt, consider staying in Mainz - it is not much further from FRA airport and it is a charming city.

I like the plan that involves staying in Frankfurt the night before the flight. I would not want to arrive three hours before a flight on a long-distance train... even more so if the train is on a line where maintenance work is being done.

If flight leaves 8:30 pm it is optional. for a morning flight a hotel near FRA would be a good decision.

Wondering where the flight will head to. Spoken about "study abroad program" I thought USA is flight destination but flights from FRA to USA rarely depart at evening hours. Maybe re-check departure time.

btw: in my opinion flying in these times is not wisely at all - but different discussion.

given that DB always delays

Not true and unnecessarily offending and mentally poor.