Supply slowly dropping? Is this regulation?

I’m 5.5 weeks postpartum. My supply has been slowly increasing, and I had my best day on 3/18. But ever since then, it’s been slowly decreasing (see graph)? Like several ounces per day. I’m pumping the same number of times, chugging water and electrolytes, eating enough, etc.

Is it possible for my supply to regulate this early? It’s disheartening to go from the high of my best day to see less and less every day since then.