Hi Ay0mikun
Welcome to the Apple (user-to-user) Community.
Re:"Wifi and Bluetooth Not Connecting"
Apple support has articles online that may help:
Connect to Wi-Fi on your iPhone, iPad, or iPod touch - Apple Support
Use bluetooth and Wi-Fi in Control Centre – Apple Support
Connect iPhone to the internet – Apple Support
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Seems wi-fi and internet connectivity issues can stem from a variety of sources, so you might need to try troubleshooting:
If your iPhone or iPad won't connect to a Wi-Fi network - Apple Support
Check VPN (Virtual Private Network) and third-party software to help resolve network connectivity ihttps://help.apple.com/iphone/8/#/iph1b489c85f
Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support
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Re: Bluetooth
Set up and use Bluetooth accessories on iPhone – Apple Support
For "non-Apple" accessories:
Pair a third-party Bluetooth accessory with your iPhone or iPad - Apple Support
What to do: If you can't connect a Bluetooth accessory to your iPhone or iPad - Apple Support
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if needed:
You might want to reach out to the iPhone Support Team:
There's a "Get Support" link (online chat, phone, eMail etc.) at the bottom of their website (link below),
iPhone - Official Apple Support
All the best :-)