Is it possible to know what G-d was doing before this creation?
While, as Maimonides states, that we cannot know anything about G-d except for what G-d is not (G-d has no body and is one), nevertheless, I think the question remains, and can be boiled down to this: are there any sources explaining what G-d might have done before creation of the world (i.e. was G-d forming past worlds in an endless cycle, as in preforming His creative energy?) Think of reincarnation but on a larger scale, namely, the universe. Indeed some scientists think this was the case before the Big Bang. If true, it would entail that this world-building will continue to occur. What were our sages' opinions regarding this?