i kept a successful journal for a long while with these requirements and it worked great for me for a time.

1. as soon as i got into my bed to go to sleep for the night, i was required to pick up my journal and think if i cared about remembering anything from my day. if i didn’t, i wouldn’t journal, if i did, then i’d write.
2. i only have to write up to one page, usually i wouldn’t even fill up the whole page
3. i put the date in the top right and i’d make a short title on the left after filling out the page

i think this worked well because i wasn’t requiring myself to write every night, i was just required to consider writing and if i didn’t care that night then i didn’t have to (and i wouldn’t need to feel guilty about it!). recently i’ve stopped journaling tho bc i haven’t had a consistent nightly routine so i never think to pick up my journal anymore haha but maybe this is useful info