I feel the same. After researching some discussion forums and Websites, I actually contacted Apple Support. I downloaded the Apple Support app, chatted with them. The support asked me to run the diagnostic from the iPhone Preference support menu, then he said that no issue with my phone. I asked him if there is reported battery issues with this update, he said that not aware of.
He then suggested me to restore the phone to make sure that not software issue (I could not do it due to Apple Pay and some installed certificates) and provided a link to me asking me to provide some feedback to their developers.
There are not many options, I have uninstalled any suspected apps (Apple Music, Facebook, Instagram, etc.), disabled background refresh, reduced mail sync frequency, disabled any non-essential location / GPS services, disabled any auto updates or backup, reducing the backlight... I have scarified so many useful features to save up some battery for daily use (I need to use Apple Pay, transport and driver license if I need to go out, not many places accepting cash for the moment).
It does not really help, so better wait and hope 13.6.1 or 14 can resolve the issue.