This approach by the infamous BJ Fogg has really worked for me.
He offers a free 5 day program, and if you can get his book from the library I highly recommend. The website is also great, and podcasts etc.
Similar and also very helpful is Atomic Habits by James Clear, and I like his email newsletter. https://jamesclear.com/atomic-habits
I track my new habits on a page in my Bullet Journal - https://bulletjournal.com/
- and try to keep the streak going. I like the paper (analog) tracking more than any apps I've tried.
xx much love to all the Permies