I need to close my Facebook account that is linked to JJ, can I make this game a stand alone game on..

Apple users can link their Apple account instead, and Google users can link through Goggle account. If you play without any of these accounts, you won't be able to play with teams or exchange bushes with others. And you won't have the ability to recover your game progress if your game/device fails.

If you want to start a new Facebook account and link your JJ game to it, contact customer support and provide it and your game ID code plus details from your game, i.e. game name, level, island screenshot, any evidence of previous purchase, team list, etc.