Note that AMD's new Zen CPU's will be a new socket with DDR4, meaning you will need a new motherboard and RAM to upgrade to it.
Your computer is pretty much as good as it will ever be, if you want more performance you can try overclocking. The 9XXX CPU's are basically massively overclocked 8350's with a massive power draw. They are supported by only a few motherboards and not really worth it.