Passwords are still incredibly secure if they are LONG, do not include any reference words*, do not only attempt to create complexity by using reference words* with letter/number replacement, and are complex.
*reference words = as a few articles of recent have pointed out, cracking algorithms and tools now reference large databases of dictionary, encyclopedia, and fictional words. They also have no care for language distinction, alphanumeric and special character substitution (including ascii code, if the website allows them - this might still help realized complexity, temporarily), etc.
If it's something your brain, through ANY kind of memorization routine relating real and fictional things, can actually recall - it's probably no good under the scrutiny of modern password cracking.
But passwords such as:
%@S&pDbg2ct4DwNbA5CEzPT7xS$Wio
even if, using a similar system, but limited to 15 characters... those aren't being effortlessly cracked using readily available tools and reference databases. Those require brute force, all-source reference, and dedicated effort.
No password, ever, can stand up to a super computer simply wiling away at it FOREVER. But, a 15 character password of absolute gibberish, styled like the quoted one (unless I'm missing substitutions for real words - I didn't analyze it

), will likely require dedicated CPU time for a few months to a a few decades. I cannot recall the "most up to date" analysis of brute force machine code breaking - a few years ago, I had read a 10 character password, one that couldn't be guessed with dictionary and database attacks, would take a few years to defeat. 8 characters required a day of CPU time, iirc, and it exponentially increased with length.
Of course, CPU processing ability has improved each year as well, so time estimates have probably dropped.
See, I use lastpass, and all my passwords are the max length a website allows, and are complete gibberish. NO rhyme or reason, nothing for me to remember.
Any password I end up remembering is because I've had to use it without lasspass autofill, like I've had to look it up on my phone and hand-type it on another device. I've remembered a few like that, and of course some websites force a change every few months so I end up no longer remembering a valid password.