i go thru slumps so much its not even funny.
it all really depends on the situation.
if im fishing with my dad i usually just stop concentrating so hard on fishing and have a fun time with him and laugh alot.
if im at the park, i'll usually just grab and ultralite and mess with the bluegills for a good while and then shoot for bass again.
if im at the farm, then the case is most likely ive fished out the pond (very small pond) so i'll go to the other pond which is always more aggressive, and fish that one for a good while, then i'll go back to the first one and it will have recovered and the fishing will be better. if nothing is working, a F-11 seems to squeak out a few fish everytime.
and generally, no matter where i am, i will just chill and fish as slow as possible, i'll find a place to sit, and i'll just dead stick a trick stick or crawl a 7-10 inch ribbon tail worm back. this gives me time to think, and it is often quite productive.
just a few of my strategies. probably the one that works the best is just to chill out and stop trying so hard and just have fun and laugh. cuz even though the fishing sucks at least im having a good time! ;D