Stuff I wish someone told me

I've been in paid search for 3 years with majority of it in a in-house position. Not sure if that's why I still feel so lost in this field. I feel like I have the basics technical things down like creating or optimizing campaigns but I struggle a lot with things like reporting and explaining why things happened the way they did or putting together an overall paid search strategy. I want to improve and really believe in myself that I am an expert in this area. If you could go back to help yourself earlier on in your career, what advice or suggestions would you tell yourself to learn?