You can try some BDSM, get some sex toys, new lube, watch some p*rn and reenact it. Try some roll playing, get somebody else into the mix make sure they are safe of coarse. Talk super dirty to him. Go to a sex shop and get a kamasutra book is the best way I know. Get him a **** ring and tell him happy anniversary. HAHA that would make him go holy f***.