Memorable passwords are generally a bad idea. Hackers use a list of hundreds of thousands of passwords that have been found in other sites they've cracked. So while "TrustNo1" might be cute, it's at the top of the list to try in a brute force attack.
A good strategy is to string together words, phrases, and numbers that mean things to you. A good password might be "BillNailgun1992!". Your son, your favorite tool, the year he was born. And adding in a punctuation mark somewhere in the phrase is useful. Even better if you misspell something, because they could try stringing together random dictionary words and numbers.
That password has 16 characters, with 52 possible values (upper/lower/numbers/punctuation), so 52 to the 16th power.
That's 2,857,942,574,656,970,000,000,000,000 possible combinations. I don't even know what you call that number.
The sun will burn out before a supercomputer could brute force it.
9 digit passwords put things into the realm of ridiculous to try to crack. 5 digits is pretty doable.
https://asecuritysite.com/encryption/passes has an explanation.