Just wanna let u guys know that I have refer to below link for tech support contact by following way recommended by @NanetteK, and my EN v8.13.3 can successfully sign in after the assistance from EN tech support! 😃👍👍
https://help.evernote.com/hc/en-us/requests/new (thank @PinkElephant for providing the link in English!)
Thanks guys for your kind assistance and now I'm a happy man with the legacy EN again!
And indeed I would say EN Tech support is quite helpful if we refer to the correct party! 😃
Special thanks to Raven B. from tech team!