I absolutely love getting turds(and other stratocaster shaped objects) to play like top shelf guitars. This is from a very semi-pro luthier who has made quality shit too. Everything u/minimalarch has said is on point. It can be a process to determine whats fucked up and how to best fix it, but it's rare I find an entirely unsaveable guitar. That's usually what the price difference in good and bad guitars is anyway. The attention to detail and setup. I get that it can be daunting for people new to it, but it's really not as hard as you might think. Just youtube your problems and find a video about fixing it. Unless it's a badly twisted neck. Just replace or throw that shit out unless it's some vintage rarity. That's my "fuck it" repair. such a pain to try and correct that.