Airflow is the only way to get heat up front, so closing the vents is not the way to go. Open them up, especially the two in the overhead panel which should be pointed toward the door. That's where the temp sensor is, behind you.

Take the left temp knob and crank it up. VX added insulation in the foot wells which helped, but keep your thin sole shoes off the metal wear strips.

Wearing tight shoes & socks restricts blood flow to your feet & lower legs, so fashion be damned, wear loose socks and loosen your laces. If you suffer foot sweat, try powder and/or gross out the other guy by changing your socks if you are cold.

Close off air & blood circulation and you might as well stick your feet on the rear windowsills next to the water bottles.

13 years in the bus, my $0.02 worth!