Hi. If you prep efficiently, you can expect to improve your score by 120 points with about 180 hours of prep. Spread over 7 weeks, that would be about 25 hours of prep a week, which is a lot, but not impossible.
But, realistically, you just didn't perform up to your abilities on test day, so that 430 doesn't represent your real GMAT skills. Taking the test the second time, you will be more comfortable and will score higher. And prepping better the second time around will help that. One should expect at most a 20 point decrease from recent CAT scores on the official test, assuming things go well.
By the way, it was a good choice to take a break from studying for a bit. That will pay off.
As far as where to start, if you want to self-study again please check out my guide GMAT Clarity
. You can use it to build a course that will fit your exact needs and help you get the score you are looking for. Otherwise, if you want to use a course this time around, I think Manhattan gmat
would be helpful.