There are three options, which I will list in decreasing order of difficulty and honour:
1. Be faster. You've improved steadily in the time you've played the game, and your DR right now is about comparable to my average. I don't know when you started playing the game, but I've played it a lot more than you so I have more experience. Getting better at circuits and more comfortable in certain cars is just a case of practice, and as stated above, watching people who are faster than you and trying to copy them is the best advice anyone can give you. Watch the top 10 times and copy their lines, braking points, gear changes, everything. Be patient, and it will come.
Even if you qualify 2nd or 3rd and you're sure you can't get anything else out of the car, follow the people in front of you as best as you can. See where they're quicker than you, and try and improve those sections.
2. Play on Mondays. At the start of the week, people are still, mostly, learning the races. If you spend a solid block of 5+ hours on the Monday going straight between races and qualifying, you'll see results. You can combine this with looking at the events page on kudosprime to see next week's events and get some extra practice in to give you an advantage. If you see a circuit you like or a car class you like, play it a lot. I got ~30 poles and ~40 wins in a week where Race A was 3 laps of Yamagiwa in a Honda Beat. I had the 91st best qualifying time in Europe.
3. Cheat. Deliberately drive dirtily to get your ratings down to D/E and farm poles/wins against weaker drivers. On occasion you might get a weekly race where contact can be frequent and incidental where it's harder to get a clean rating anyway - see Tokyo South, or this week's Blue Moon Bay.
Option 3 is obviously terrible and you shouldn't do it. I also can't speak for the playerbase in North America, so I don't know how varied the races are in terms of DR or the driving styles of the various players.