Hi there, @Sopo. Welcome to the Fitbit Community Forums. I'm sorry to hear that your Inspire 3 is not charging nor turning on. I will do my best to help you with this!
As a first approach, please note that sometimes a Fitbit doesn’t seem to be charging when actually the issue is that it has become unresponsive (this can happen if the battery has been allowed to discharge completely). I'd recommend putting it on to charge on a charging wire and outlet known to be working. Leave it on the charger for a good two hours, even if it doesn’t seem to be charging.
When it has had two hours, try restarting your Inspire 3. I would recommend trying this maybe twice in a row if a first try doesn’t work.
If the above doesn't work, please see Why isn't my Fitbit device's battery charging?
Regarding the battery level on the Fitbit app, note that it updates every time you sync. That means that if your Fitbit device hasn't synced yet, your app will still show the battery percentage of the last sync.
Once you charge your Inspire 3 make sure to sync and you'll see that the percentage on your Inspire 3 will match with the one on your Fitbit app.
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