Hello,
Any planet or asteroid touching the MC has an effect in career.
The MC though is not career per se, but the highest goal in one's life. So it will affect your highest goals, much of which for the average person are career-based.
I'm not sure an asteroid in itself will change much though. It could be other aspects at play, especially slower-moving/outer planets.
Of these affecting you now:
Jupiter - currently square your Sag MC, but could be sextile when it goes into Libra
Saturn - conjunct your Sag MC, this could be causing issues, or making you feel more grounded and restless
Uranus - trine your MC, making you feel more prone to change or restlessness
Neptune - 1st house/conjunct ascendant, more intuitive, listless
Pluto - 11th house, not near MC, but could affect inner/personal planets.
imho, Saturn and Neptune are possibly factors here.