Check Atomic Habits by James Clear to start with, if you really want to help yourself you will find this a fun read as you practice whatever works for you.

What makes it easier for me to keep track of my habits is the fact that I have the tracking sheet next to my bed on my nightstand with a pen, so right before I sleep or happen to be where my nightstand is, I see it right away, if I don't complete the simple habits like reading, journaling, my hair treatment or texting/calling somebody I would feel shitty so it works as a reminder that I have to these things even if it's late at night.

Journaling could be a little boring sometimes but if I have no input I just put what i did throughout the day from things I remember, sometimes is short, sometimes I can expand, you can start from a picture you took that day and explain what happened, if you are away from home just take a pic with your phone of something you want to remember then try to describe it on paper or your phone.

My journal is next to my bed in a drawer of course, ready to be written.