I bought one of the these.
Has most of what I need. I don't do much custom cabling so I don't really need a crimper. Other than that maybe get yourself a voltmeter and you should be good to go.
For general repair stuff I have https://www.amazon.com/gp/product/B06Y2N568J/ for home use because its nicer then my work kit and I dont want pieces to go missing.