Did you follow these instructions?

https://www.ionos.com/help/email/other-email-programs/setting-up-a-mail-basic-account-in-thunderbird/

I did all this my domain is purchased from go daddy by when i bought CDN from cloudflare all the DNS listed there, but i think something wrong

Incoming Authentication Method: suggest you try 'Normal Password'

Thundrebird 78 changed minimum TLS.

Try changing the setting to see if you get connection. In Menu app icon > Options > General Scroll forever to the bottom and click on 'Config Editor' accept the risk In search type: tls.version look for this line : security.tls.version.min Double click on line to open an edit window and enter the number 1 click on OK. Exit window - top right x

This will set that preference back to the same level as used automatically in version 68*.