Back in 1986 I felt like you and just got tired of the series of 71 Cuda Convertibles I had amassed over the years: 383, 440-6, 426 Hemi... I sold them all, thinking I was getting out of Mopars completely and bought a Ferrari. (everybody say BIG DUH here) After 6 months I was tired of the Ferrari and went back into Mopars but this time concentrated on Chargers. I found the 70 Hemi Charger R/T-SE that I still have today and a few others that I have sold off over the years, long before the prices skyrocketed.
My advice would be sell them and maybe try a new auto venue. (Not Ferrari though

) Every three or four years I try to pick up a new project that I have no experience in, learn everything I can about it, and then restore it. I did that with the Z11 pace car, and more recently with the 72 Trans Am I am currently playing with in the garage. It keeps you and your mind fresh. You only start growing old when you stop learning new things.