I am afraid to uninstall & reinstall. I was advised to by the community when I had Candy Crush Friends & it was wiped. I am on level 3312 & I don't think I could start from scratch .
As long as you have a King account that allows you to sign in and out with a password your progress will not be lost. I was at level 6094 when I uninstalled so I understand being afraid of having to start over. I don’t have Facebook but I can sign in and out of my King account with my password. Therefore my progress is always saved. As stated before you will lose your boosters.