when you compare things with the ATH it obviously looks like decreasing. it is like saying bitcoin price is decreasing because it came down from $20k instead of looking at the bigger picture that it has increased from $0 to $3k+ in a short time.
the payment processors are actually seeing an increase in their usage but when you compare it with the ATH which has always been also the ATH of payments, it obviously looks like decreasing.
as for the adoption, it is not something that stops. it is always ongoing but since the price is not moving the media doesn't cover it much and consequently people don't hear about it. for example did you even know that a US state recently adopted bitcoin as a legal currency?