Things are starting to heat up and in my opinion, the cracks are beginning to show in markets. To recap FOMC today, the Fed decided to pause rates (dovish), but Powell expressed their intention to raise rates two more times at least. He also mentioned that rates will likely not drop for roughly two years.
What I'm seeing is that markets continue to rise without returning to daily support levels. The longer this keeps up, the more extended the market gets and the further we will likely fall when the euphoria dies down. It doesn't matter much to me if SPY goes to 440 or even 450 - as long as floors aren't established, fewer institutions will look at prices as "fair value." The breakout at 416 didn't see a real retest and resistance at 422 was gapped overnight. These are both areas I'll be targeting with SPXU. I'm watching similar moves with SQQQ, AMD, and NVDA.
Resistance is at 437.40 for tomorrow, followed by 443.89. Support is at 429.70. 
SPY Chart. 
QQQ Chart 
AMD Chart