It sounds like you want mania. For what it's worth, 1500mg lithium is very likely going to keep you away from that. Lithium is the gold standard mood stabilizer, and the thing it does best is keep mania at bay. Have you had blood levels drawn recently? You could be over the recommended dose. I'm not advocating for dropping your meds by any means, but lithium can make you feel flat even in the therapeutic range.

Most likely what you're dealing with is withdrawal from the Seroquel and Abilify.