Salomon has you on the right track for diet. You can decide how much dedication you have and then I think that's the best way to choose what diet you like. I personally don't have the dedication for paleo, but I do have enough dedication for iifym (if it fits your macros) and intermitent fasting, so I stick to those two.

I personally only got into diet within the last year or so, which would probably explain why I haven't plateaued since.

I have been wanting to be a personal trainer for a while and would love to have you as my first non family client. As my first client it would all be free, and all I would ask that you give lots of feedback.
We can do skype calls too if you like and I can walk you through the tools I use.