All in all, KeePassXC definitely earns mention among the best password managers, though it comes with some sizable asterisks. The biggest one is that as an open-source product, it may be free, but it also lacks the polish of many industry leaders. As such, it’s not for everybody, though anybody that likes old-school cool will love it.
Yes it’s also not had any independent 3rd party security audit (but then again you download and use it locally on your machine). I’d certainly still benchmark it with either the free, or paid version, of open-source Bitwarden (which you can also self-host for free) which has some rich functionality as well as cloud sync across all devices.
See https://www.howtogeek.com/879987/keepassxc-password-manager-review/