honestly so fed up with my 18-105mm kit lens its just not giving me that blurry background everyone wants for portraits and everything looks kind of flat and muddy honestly. im super anxious because i promised to do my sisters engagement photos in seattle next weekend and i dont want to let her down but my current gear is just failing me every time i try to practice.

i have about 500 bucks saved up and i need something sharp like right now. i keep hearing conflicting things about the 50mm and 85mm but i dont know which one is actually better for a d7500 crop sensor or if those are too zoomed in for outdoor shots. which prime lens is best for nikon dslr portrait photography?