as with many of us, time is a challenge. So, I've booked 2x flights in the same day:
XER-FRA-MRS / MRS-FRA-XER in Z for 403€
and accordingly
MRS-MUC-FRA-OTP / OTP-VIE-MUC-MRS in D 990€.
My route will look like this: XER-FRA-MRS-MUC-FRA-OTP / OTP-VIE-MUC-MRS-FRA-XER for 41.250 SM.
That's a 34,17€ / 1000SM.
The above + my current mileage (40k) + 1x LOT FRA-WAW-OTP RT in Z + 1x NUE-MUC-OTP RT in P = qualification for another 2y.
After my last year overspent, now I'm pretty satisfied with the fact that my only compromise was this complicated route, which means 2 days of being pretty tired.
Everything else was justified.
I tried to upgrade NUE-MUC-OTP to Z or D... but was too expensive. They asked for 53€/1000SM in Z and 48€/1000SM in D.
But my 34 is still far far from
which pushes me to ask "wait, but how?!?"

since the normal quote on this route is double than that.
Have you used any award miles?