Make it simple and easy to create Keep reminders, and add text-like notifications for delayed Keeps.  This would make Keep a truly convenient and differentiating feature.

I used to send delayed texts to myself as reminders, but my carrier stopped supporting texting myself.  It was a great system: easy to compose a text, add a delay, and get a standard notification to complete the reminder.

Currently, it takes a few extra steps to create a Keep compared to a text.  If set to Delay, no notification is seen when the time is hit.