As long as that password is the one for your password manager, all good

If you mean it's the same password you send to basically every website you visit:

It is a matter of time before your password is leaked in a data breach, if that's not already happened.

That's very dangerous. It's still a very good method to write the most important passwords into a little notebook and put it somewhere not totally obvious at home.

1 really good password (for your password manager) > 20 passwords only good enough if the software can prevent bruteforcing

give us a hint, lets make this fun

I have a base password that I modify in somewhere 2 characters after the middle to derive all my other passwords from and yeah it's the only cool thing I have.