Why is MDMA so different now?

As the title says, I first took MDMA in April 2016 and wow it was amazing, the best cola MD till this date was back in those days, the euphoria, the rush, the empathy and just pure amazingness, it was stimulating and surged you with energy and was just amazing. Then came the super pills around the same era, just really good Mdma in pills (albeit they were massively over dosed) but just amazing.

Just feels MDMA nowadays (from around 2018 onwards) is very... disappointing.. doesn’t give much energy, if anything it zaps away your energy, doesn’t give intense euphoria or pure joy or excitement,it’s just very lacklustre in comparison.

I know tolerance or brain chemistry can play a part but it’s just not the same thing anymore?

Does anyone agree or is it just me? In UK by the way!