Repotting may be just the thing to "shock" the plant into blooming, since it's apparently not the type that needs a temp drop. You also might try moving it to a location where the light intensity / duration is different from where it's growing now. Reluctant bloomers will often respond to the (small) "stress" of being moved from where they're used to growing by sending up a spike. At least, that's what we've noticed in the greenhouse here: a change of microclimate many times induces bloom.