No power to dash, lights, ignition doors widows radio.. No crank. Dead

Car needed jumping. A couple days later needed jumping again. . Randomly would start. Or not. Somet jumps would be dead first 3-5 times trying the ignition before cranking. Always started when it cranked. Changed battery. Worked for about 3 days. Same business. Then driving home. Went dead in middle of road. Put in park. Pushed into parking lot. Put in park. Tow truck couldn't get it to neutral, even with jump battery. Replaced corroded terminals. Took the battery to autozone. Said it was 100% carged and good and that my 4 year old alternator was probably not the problem either. Came hime put battery back in, Started it and worked. For a few more times. Oil, topped off coolant. Jiggled the spark cables to see they were down because the idle sounded like a rocker was loose kind of sound. Went to start it Dead again. No power. Just a click when I turn the key I have the ignition switch out ready to replace it. At 269 dollars I want some professional to give me some advice as to if I am on the right track. Or should I be looking at something else.