You said the SPX topped at 2400. Today is the first day since that it looks a little toppy to me, not that my opinion matters. I still like US markets this year but extreme short term I'd be wary.
Forget 'tops' When trading 'up instruments' that literally HAVE to go UP over time, look for bottoms instead
One needs to remember that there is still a lot of money in cash. Can the market go down? Certainly. But trading with the longer term trend is the correct method.