(I doubt this is original)

To help yourself do something regularly on a computer, put a direct link on your bookmarks bar.

Example: you want to keep a diary. Write it in a Google doc document and put the direct link to it in your bookmarks bar, so that one click is all it takes to open it. Not in your bookmarks somewhere else, not in a shortcut on the desktop (your browser is open all the time anyway), not a separate fancy diary-keeping software, but just one click in a place that's always in front of you. If you're like me, that'll help a lot.

Perhaps anti-intuitively, the difference in results is huge even between "one click in the bookmarks bar" and "one click to open a folder in the bookmarks bar and one click on the right link in that folder".

P.S. Alerts are also good, but this method helps where alerts aren't helpful. You want to train yourself to write a quick review of every book once you finish it. There's no way to set an alert to go off when you turn the last page in Kindle. But put a link on your bookmarks bar.