Sacrilege
Well if you took on Maariv for a particular reason definitely stick with it unless it becomes too much of a burden.
But seriously you have a chiyuv to daven Mincha. Its not really optional. I don’t know your work environment but I can’t imagine there isn’t even 5 minutes to quickly Daven a Mincha.
People find time to do the things that’s important to them (like eat, go to the bathroom, shmooze with friends, send text messages…) nobody has time for Hashem. Its depressing.