-listen to other live sets... try emulating the work.
-try producing for a bit (I know you do produce as well)
-play some tracks you've never played b4 or very often.

I hate those slump times... really discourages making good mixes

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'-.SgtFoo.-'
My SoundCloud

another thing i tend to to, mainly for fun when i get into a slump, is play all the same vinyls, but play the opposite side to which i usually play.. it tends to work out quite well and it is reasonably fresh music on your ears..

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MUGGETS