I get the idea as I used to do this too. Having secure & different passwords everywhere is just the basic way to go. As such I dont think though its a good idea to put a system in your passwords. Hacking attempts are automated and getting smarter every day. Its only a matter of time until someone unleashes an AI to look for patterns and you are toast.

I recommend to juse a decent password manager that generates them for you and as much MFA as possible.