2011 Buick Regal - Ony 1st

My car is not shifting out of 1st gear

Then you clearly have a transmssion problem. Take it into a local independent transmssion shop.

Without more info…I’ll guess.

Clutch master cylinder is shot.
Clutch fluid is empty.
Clutch slave cylinder is shot.
clutch is shot.
Transmission is shot

Automatic; shift solenoids are shot.

I’ll fix it all for $7