It is generally advisable to only install from installers sourced directly from apple servers. The problem afflicting installers from 10.7 onwards is expired certificates - even ones previously downloaded from apple servers.
There are 2 ways of dealing with this. One way is to go back to apple's support page
https://support.apple.com/en-au/HT211683 every few years and redownload ALL of them. These will have updated certificates.
The second way is if you are using an installer with an expired certificate, either previously downloaded from apple, or one from another source is to boot up from the bootable usb and use terminal to change the date of the computer to around about the same date as the release date of the installer - before installing. This circumvents the expired certificate preventing it from installing.
In the case of 11.2.3 which was released on March 8, 2021 you can proceed as follows.
You can make a bootable usb for 11.2.3, boot up from that and change the date of the computer to midnight March 9, 2021 with terminal command sudo date 0309000021
The format of the date is [MM][DD][HH][MM][YY], that is month, day, hour, minute, year.
You can also check the date has been reset with terminal command date.
There is a possiblility that your efforts may be thwarted by automatic network time resetting. If this is the case you can turn it off with command sudo systemsetup -setusingnetworktime off
PS. Don't feel too bad if you are forced to source apple software outside apple. Even apple themselves did this a few years ago when they lost an old beta version of System 7 and bought it back from some dude on ebay.