Other Things.

Try listening to new music (radio)?or reading new novels
Can I write both lyrics and music?To write you must be in a certain frame of mind - more precisely, one where you feel relaxed and at ease with writing what comes to you. To get into this state of mind, you must allow yourself a certain amount of time to write. You must think, okay now, I'll dedicate myself to producing some lyrics. Now is my time.
Musicians are people. People conform to human nature.We feel the temptation to shift our focus into music or lyrics. Sometimes, we feel it's too hard to do both. In truth, it's not; trust me. But before you can allow yourself to practice both making music, and writing lyrics, you must allow the time for both. If you can't write lyrics now, write them later. But don't deprive yourself of the time.
Closing Comments.

I wish you luck with your karate, (breaking that block)/overcoming that lull/whatever you would like to call it. Because in truth, musical, or lyrical... the creativity and inspiration is within you. The hardest part s finding that out, and then finding out what to do with it.