I think the "love affairs" dimension of the 5th house has been blown all out of proportion. The 5th is the "fun house" or "party house." It rules all kinds of recreational activities. Love affairs ended up in this house, in the sense of flirting-- or bedding-- as a fun thing to do. But so did gambling, the theatre, attending horse-races, games, or whatever else people like to do by way of hobbies and leisure activities. More importantly, it is also the house of children; but obviously for childless people it is worthwhile thinking about your own "inner child" with all of its spontaneity and creativity.
If you want to write, I'd say, "Go for it!" You have a very strong Venus (rules the arts) in the 10th house in its own sign of Taurus. Writing is associated with Mercury. Squaring Mars and Neptune, your Mercury is definitely in touch with your 5th house planets, but just suggests more effort and struggle, rather than an easy flow of ideas from your imagination onto the page. However, sometimes squares are good career indicators, because they have the quality of being driven to manifest the qualities that the planets represent. Neptune/Mars sextile Jupiter and sun trine Neptune suggest that you have a vivid imagination; and perhaps (with your 9th house sun) a philosophical turn of mind.
However, what have you done to develop your writing skills? Taken university courses in creative writing, joined a writer's group in your area or on-line, or entered some short story competitions? If not, Pluto and Uranus in transit could be used constructively as wake-up calls to get rid of whatever stalls you from pursuing your deams, and to get your career goals on a new footing. For example, how do you write your best work, and have you organized your life to create that kind of space on an ongoing basis? Pluto and Uranus are definitely energies of "out with the old, and in with the new!"
One of the main blocks I would see is that with your moon-Mercury-Nepune Mars T-square, you may be very sensitive to criticism; or you may be your own worst critic. So now is a good time to read up on all those famous writers who were papering their bedrooms with rejection notices from publishers, until they had their lucky break, found a publisher willing to gamble on them, and made the best-seller list. And just think about criticism as a trigger to improve your work, not as something that means you cannot achieve your goal.
Good luck with this!