Note that I am a novice in Hellenistic Astrology. Take my advice with a grain of salt.
Regarding the career question, well, if we follow Claudius Ptolemy's method,
"The lord of action is apprehended by two methods, from the sun and from the culminating sign. For it will be needful to look both for the planet that has made its morning appearance closest to the sun, and that which is at mid-heaven, particularly when it occupies the application of the moon; and if the same star occupies both the aforesaid positions, this alone must be employed, and similarly if none occupies one of these places, we must use only the one which occupies the other of the places.
And if one planet has made the nearest morning appearance and another is associated with the mid-heaven, and with the moon, we must employ them both, giving preference to the one which by reason of its strength has the greater number of claims to domination according to the scheme which we have already set forth.
But if not one is found which either has made an appearance or is at mid-heaven, we must take the lord of the latter region, with reference however to the occasional pursuits of the subject, for persons with such genitures are for the most part inactive.
Thus, then, we shall determine the planet that governs action. The quality of the action, however, is to be discerned from the character of the three planets, Mars, Venus, and Mercury, and from that of the signs through which they happen to be passing."
[Tetrabiblos, Book IV, Of the Quality of Action]
Basically he is saying to look for a planet(s) that is either going through a heliacal phase (either rising or setting) or is in the sign where the midheaven lies, which is usually the 10th sign. But it cannot be any planet, it has to be either Mars, Venus or Mercury.
In your chart, I can't determine exactly which planet is undergoing a heliacal phase, but I can guess that Mercury is heliacally setting (he becomes invisible within 7 days after your birth due to being close to the Sun). None of the three planets are in the midheaven's sign (Capricorn).
Tentatively, I would choose Mercury as Lord of Action, the problem is that it is cadent by Porphyry house division, that lowers his fitness or strength.
Julius Firmicus Firmicus also mentions a similar method of choosing between Mars, Venus and Mercury for occupation, but his method is different from Ptolemy. According to him, we should see whether any of these planets are in the MC. If none, look for them in the other angles, and if none either, look at the 2nd and 6th houses.
Using this method, both Mercury and Venus are potential candidates, as they are in the 4th house and 6th house respectively (by Whole Sign houses). Venus is in her own terms (Maternus's table of terms) but in fall, and she is of the sect, although in the 6th sign. Mercury has no dignities, is contrary to the sect, and is in a semi-favourable 4th sign. I'd say that Venus is a better candidate here.
Using the first method, Mercury would signify occupation, while by the second method, in my opinion, I would elect Venus to signify occupation. Mercury signifies scholars, business people, those that deal with numbers and rational patterns, gamers but sometimes also athletes. Venus signifies those occupations related to pleasure and delight, like acting, painting, singing, dancing, but also selling jewellery and makeups, etc. Fashion designing falls under Venus.
Without looking deeper, I would say that being a fashion designer might work for you. Do you find studying uninteresting?