Bitcoin is being developed. You have Square/Twitter/Jack Dorsey looking to make Bitcoin payments a reality. You have El Salvador making Bitcoin legal tender. You also have a narrative of being a store of value.
Bitcoin Cash lacks the narrative of being a store of value. It is getting eclipsed by newer/better projects.
It's like the Sony Minidisc that got eclipsed by MP3s.
These are my opinions and I may be wrong. I have been wrong multiple times. Paypal and Robinhood are giving these chains a lifeline and when investors become more educated, they will continue to fall further down the ranks.