Hi there, @Jesusa1974. Welcome to the Fitbit Community Forums. Thanks for bringing this to my attention and for the troubleshooting steps you've tried. I'm sorry to hear that your Sense is not tracking your heart rate. I understand your concern, I will do my best to help you with this!
In addition to the steps you've tried, may I know if you have tried to charge your Sense? If your device has no battery, none of the features will work. 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 Charge 5. 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?
Once your device is fully charged, please see if the heart rate monitor starts working again.
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