There are websites that allow you to pick whatever 23 mnemonic words you want from BIP39 wordlist, and then last word is calculated to create everything correctly.
I wouldn't recommend anyone to do this because our brain and thinking is total disaster in term of creating anything random.
One of the website I saw before is called seedpicker, but do your own research and read the guide before using it:
https://seedpicker.net/calculator/last-word.html