Your MC and mine are conjunct. Seven years ago, Mercury stationed retrograde in early Scorpio and crossed my (our) MC during that retrograde. That was when I joined this forum.
Two years plus three months later, I became a moderator at the end of a Mercury retrograde that hit my AC.
There's definitely a pattern with Mercury retrograde over those points for me, at least in relation to this forum. And it's feeding my career, in a way: I'm a semi-pro astrologer now, and I got my start interpreting charts here. It was my experience here that inspired me to branch out, go to an astrology meetup in my area, take some more formal classes eventually, and do more astrology things.
For you, since you have your Sun at the MC, and Venus too, anything triggering your MC is likely to play out in an even bigger way. (I have Uranus at the MC, but no personal planets.) Venus being your MC ruler puts an even bigger spotlight on MC things such as career and public identity.
This won't be the first time you've had Mercury retrograde over that spot, and this won't be the first time you've had any strong planetary trigger to it.
The point is, it's simply a spotlight. It may be a regression, or not. It may be a trigger that gets something going for you. Mercury retrograde can be a time when Mercury sorts of things, like contracts and communication, go sour, but at least as often, Mercury retrograde triggering your chart brings a realization that you need something. Or someone else deciding they need you, perhaps (like when I got asked to be a moderator). It can be as simple as that.
Mars in the mix adds some Mars energy, but again, that's not all bad. It can simply bring out passion in you, or push you to stand up for yourself. Mars crosses your MC once every approximately two years, so, again, it's happened before, many times.