Looks like a string of sites have shut down over fears about being unmasked and legal action being taken against fmovies, who were running most of the sites.
https://kaido.to/home is being discussed as an alternative. I am unfamiliar and can't vouch for it at this time though.
https://4anime.gg/ still exists and works too.
I went to zoro.to and it redirected me to ACE's website
yes, zoro.to is gone, kaido.to seems to be the exact same thing
Oh, I thought you were saying to use zoro.to instead of kaido.to.