Hi, welcome to the forum! Glad you joined!
I live in Polk city, fl my self and have 6 acres. I have egg chickens and would like to get meet chickens that I can breed myself just for my family. I what to stay away from the Cornish x. What’s the next best breed?
While you can eat any chicken there are three types we raise. Types, not breeds.
Cornish X were developed to be the ultimate meat chicken. They grow fast and have a great food to meat conversion rate but they are really hard to breed yourself. And you don't want them so enough said. Lots of people do not want them.
The next type are Rangers. Lots of different strains of these. Rangers are bred to be butchered around 12 weeks of age and can be pasture-raised easier than the Cornish X. They grow so fast and eat so much that they can be challenging to keep and breed but as long as you don't overfeed them you can usually keep them to breed. There may be a learning curve. They are hybrids, not a breed, so they don't breed true but practically every one of them are good meat birds. This "not breed true" mainly means that some are better than others. They can possibly eat themselves to death but not nearly as badly as the Cornish X.
Then we have the dual purpose breeds. A lot of different breeds. Even at 16 or 20 weeks they will not be as big as the 12-week-old Rangers, let alone the 6 to 8-week-old Cornish X but a lot of us raise and eat them. They don't get too big to breed like the CX or Rangers might. People have their favorite breeds but that is a lot of personal opinion. Everybody can have a different opinion. What breed are your egg layers? Have you tried eating them?
I hesitate to mention breeds because others are going to have other preferences. I'd suggest you consider Delawares, Rocks, Wyandottes, and New Hampshire. But there are a lot of other great ones that should do well in Florida.
My suggestion since we all have different conditions and preferences is to get several of three or four different types or breeds and raise them yourself. See which do best in your conditions and which you like best. My opinion does not count as much as your opinion for your chickens so try a few and see what you like.