You can easily become bored if you are doing the same thing over and over again. The simplist answer is just try new things.
I would also be interested in asking how do you feel regarding your energy levels - mentally and physically?
First, make sure you give yourself enough time to do the things you want to do.
Make sure you are looking after yourself - if you aren't treating yourself well you could be draining yourself of energy to go out do things, give yourself the best chance of getting off the couch or whatever.
Then, go and socialise, join a group, sporting activity, or club that you may enjoy.

Stimulating your brain by doing something different, anything different from your normal daily routine will exercise your brain. You will feel better, more energised and alert. Good luck!