Hi, gadisperang.
Welcome to the Apple Support Communities! We understand that you’ve been experiencing an issue getting a couple of your Bluetooth accessories to connect after updating your iPhone 11 to iOS 15.2, and we'd be happy to offer some assistance.
It sounds like you’ve already done some incredible troubleshooting. Let’s work though this Apple Support article to make sure you’ve tried all of their suggested steps first:
If you can't connect a Bluetooth accessory to your iPhone, iPad, or iPod touch - Apple Support
One of the last steps is checking with the manufacturer.
We did a quick search for some troubleshooting steps for your earbuds. Check to see if you need to reset or update the firmware here:
TOZO | Wireless Earbuds, Headphones, Chargers, Watches & More Electronics
For your Fitbit, this may help:
Update, Restart, and Erase | Fitbit Charge 5 User Manual
It’s not uncommon for accessories to need a reset or update after an iOS update. We hope this helps!
Warmest Regards.