need some advice (putting sets togeather)

Everyone gets the blues.
There is a simple solution:
Get in a comfy chair, in summer in a sunny garden, in winter by the fireplace.
Get yourself a nice drink, for under 21 get a glass of milk, over 21 maybe a Pinacolada.
Relax yourself and put a nice playlist on from someone you like (like a spotify list or something).
Really relax and enjoy the music, do not think about DJing or mixing, just enjoy and relax, even better when shared with a loved one.

The urge to mix and the mojo will come back by itself. You will remember that it is fun and not a mission.

Terry has the right of it.

We all *should* be doing this because we love music. Rediscover that and the rest will follow naturally. Been there myself more than once.