Whatever you're not enjoying, stop. Whatever you are enjoying, keep. A career is too long to be carrying the things which turn it from being "a hobby" into a "real job"™.

I've often found that if I tried to do something because I thought it would be good for my long term career prospects I just wasn't that motivated. However I often found myself circling back to the same technology or topic at a later date out of pure interest and was highly motivated then. Attitude toward what you're working on and your reason for doing it is almost everything.

Sounds like you're maybe feeling a little burnt out if I'm honest. It happens to all of us. Whenever it happens to me I either increase the frequency of my other hobbies I enjoy (water sports) or if its a particularly bad spell, try looking into some completely unrelated area of inquiry (for me that can be space, cartography, travel, electronics, brewing beer, etc - even learning a musical instrument). I find that it not only stimulates my mind again but ultimately I start to make new connections about how my existing software skills can be applied to this new area of interest. New project ideas start to flow... and off we go again.