I'm not sure how much you know. The dotted green lines forming a triangle to the blue line (sextile aspect) are the yod in your chart. It's Mars, Pluto, Neptune with Mars at the fulcrum.
Here's a definition from the website
http://sisterrayastrology.com/power.htm that is better than I can do:
"For those of you who are not familiar with the Yod configuration, it is an isosceles triangle formed by two planets sextile each other and both quincunx a third, fulcrum planet. Like the Grand Cross, the Yod can be said to be one of the most challenging configurations that can occur in a horoscope. Just as a person with a Grand Cross can feel like they are always “up on the cross” in life, so too is a person with a Yod “crossed,” in particular, star-crossed by the Finger of Fate, for the Yod is also referred to as the “Finger of God.”"
So, that sounds pretty neat, right? Chosen for something? Fated? Yay! But the problem is figuring out what the hell that is. You may find yourself bull-headedly marching into something and then changing your mind about it completely. Or maybe that's just me. I have a Moon fulcrum. That indicates that my "Finger of God" or purpose is somehow related to the Moon energy, which is being fed by my leg planets.
Or "fed" might be the wrong word. The energy could maybe flow easily from the legs to the fulcrum, but it can't because with the quincunx, you have incompatible energies.
Yours is pointing at Mars in Gemini in the 10th house,
Again from the website:
"With Mars fulcrum:
MARS – Symbol of war, combat, action, military impulses. You have been chosen to take up the sword, whether literally or symbolically and fight for a cause.
CHOSEN TO ACT, TO BATTLE"
and the leg planets are Pluto in Scorpio in the 3rd house and Neptune in Capricorn in the 5th.
I'd say with that focal Mars in Gemini in the 10th, you'll feel called to do something public using a facility with language and/or the ability to charm/act/adapt or maybe an ability to synthesize information: writing, acting, speaking, politics, espionage
Mars could indicate something like law enforcement or the military, or it could just mean aggressive energy in this pursuit, whatever it ends up being. I'm making it sound like the fulcrum purpose is the same as career...that's not necessarily true with a yod, but I think it might be true in your case because of where yours points (10th house).
One other little issue...Mars is conjunct chiron. So you may feel blocked in using that energy you need to use.
As for how those leg planets get involved, you're going to need someone with a lot more experience to give it a go.