Been stuck with this issue myself for a long time. I'm grandfathered in on the free service from back when it was still called Google Apps. All my family have an email address on my domain running through it.
Because of whatever policy they have in place, I can't sign up for Google One, I can't get a shared family YouTube Premium account, I can't invite family members to my Google home.
"Switch to a normal Gmail account!" they say. Brilliant, so I then lose access to all the apps I've purchased and there is no way to migrate years and years of email, calendar entries and all the other data Google holds on me. I don't want to have two separate Google accounts, it sort of defeats the point doesn't it?
They need to do something to sort this out. Either allow Gsuite users into the fold or give us an easy way to migrate everything over to a normal Gmail account without losing everything!