I'm at 20 billion prestige with c.5 billion more to add (nearly three weeks' worth) next ascension. Selling a Chancemaker and casting Spontaneous Edifice is netting me approx. 24 million prestige (gradually reducing) every 40min or so. I carry out this ritual a couple of times in the morning and 8-10 more times in the evening. It doesn't seem any amount of active play would have anywhere near the impact on prestige as this slow, steady, pretty much inactive technique of gradual incrementing.
So is that it? Is this the game from now on, barring the odd sugar lump upgrade?