You need a password manager!
Saying “safeguarding your identity online is important” is almost like saying “wearing a seat belt is important”; that’s quite an understatement to make. There’s no lack of incentive: 2010 had some very high-profile security breaches, and it may very well be that your account (or a loved one’s account) was impacted.
But theory is one thing, and practice is something different entirely. Using a password manager may feel counter-intuitive: if I know my password by heart, I feel like it’s “mine”; it feels private, personal, and “secret”. Writing it down somewhere might make it feel like it’s not as private.