Hello @Veni1122, welcome aboard to the Fitbit Community! I'm wondering what Bluetooth option are you referring? Is this option disappear from the Fitbit app or your phone settings?
Note that you need to use your Bluetooth to sync your tracker, however this setting is only accesible from your phone settings and is not available directly from the Fitbit app. But maybe I'm confuse with this, so I would like to have more context to find a better solution for you. Feel free to share a screenshot. To learn more about how to upload a screenshot the following post will guide you through.
In the meantime I can assume you are experiencing syncing issues, so perhaps the following post will give you some extra help: Having trouble syncing? (here's how to fix this).
Hope this helps and I'll be looking forward to your response if you need more help.
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