The number and nature of these different somethings are as many as can be, and their combinations as complex as one cares to imagine possible. But it is a good bet that there will never be found a barrier, condition, experience, or particle beyond the spectrum of somethings. If there is it isn't a functional consideration at this point. The number and nature of the Nothing does not exist. Granted, it is a persistent idea, because of a semantic double cross involving calling people beings, when perhaps they are not.
People are by products, somethings.
God is one word, burdened with a lot of semantic distortions. There may be others, but it seems likely that no word could carry the substance of that territory with much accuracy. The paths that lead beyond all somethings may be few. At the end of any path that really does so, on the raw ground of consciousness experienced, there is a simple end to the quest. There is no more carrot.