Earlier quoted context omitted.
My Chromecast from 2013 still works.
Mine still "work" but something changed around 2017 and they became so unreliable I don't bother any more. The Chromecast to Device connection is lost after about 10 minutes, making all controls not work. Can't pause, skip, select a new episode, etc. The fix is seemingly random - maybe 50% of the time recasting from the app (Netflix, Hulu, etc) works. 30% of the time mucking around in the Google Home app will work, a…
Could be any number of reasons why you are having issues unfortunately.