Faced with a similar situation, what I did was buy an arduino board, design a wonderfully complex robot, and start working on it on the side. When I feel tired and bored, I picked up some paper and would start designing parts of the hardware. I'd get back home and implement it.
Doing one thing with absolute focus leads to boredom, and boredom leads to burn-out. You need to keep yourself mentally interested by having something that actually interests you. Something big, something impractical, but something revolutionary.
For some people it's fitness, for others it's robots. You need to find the side project otherwise you will just see this long dreary never ending hole.
What you can do is also find something that overlaps with part of your work, so you can do work for work, but take the stuff you learnt and apply them to your side project.
Doing one thing with absolute focus leads to boredom, and boredom leads to burn-out. You need to keep yourself mentally interested by having something that actually interests you. Something big, something impractical, but something revolutionary.
For some people it's fitness, for others it's robots. You need to find the side project otherwise you will just see this long dreary never ending hole.
What you can do is also find something that overlaps with part of your work, so you can do work for work, but take the stuff you learnt and apply them to your side project.