Will not turn over, just cranks

My vehicle has problems starting. Only after multiple attempts (5+), it starts.I took it to a place (Midas), where I was told it was the crank and cam sensors. I was told after they are replaced it would start. The charge would be $800.00 (parts/labor).I replaced my crank position sensor as well as both cams, myself (to save money), but I am having the same problem, except now it won’t turn over at all. What did I do wrong? I ordered the right parts. When I try to start it, nothing happens, but when I remove the key, I hear clicking.