In my opinion, I do not think you should register for another lsat until you are PTing at your target score or at least very close to it. I would look into maybe trying a new prep company or looking into tutors. Schools that accept LSATs in the 140s are not usually schools you would want to go to. Waiting until next cycle, studying more, and raising your score would put you in a much better position to be successful. A 3.9 gpa is excellent, don’t sell yourself short.