Well, again, a highly personal decision. Really depends on your personal situation and personal plans.
However, as due to the fact that you are not part of a bot league, I would say save your points. You are currently right high in your league. Thus, not being in a bot league, there is a high probability that the other, in the final ranking lower placed teams will get the really good prospects of this draft year for whom it might make sense to invest your drafting points.
You can plan to heavily invest your draft points in a season, where (maybe due to planned tanking season?) you might finish near the end of your league. In such a season, the probability to get one or even two really-really good prospects is higher than in your current situation.