* Read part of a book before starting work.
* No HN/reddit/etc until noon.
* No Facebook until 6PM.
* Disable almost all notifications.
* Only check emails/texts once an hour at the top of the hour.
* Use software that respects my desire for focus.
The last one is currently the most interesting to me. When I was going through disabling all my notifications, I realized you can't truly turn them off on FB messenger. You can only mute them for up to 24 hours. After that I decided to remove any software from my life that was created to manipulate users rather than empower them. That's mostly meant switching to OSS apps and self hosting.
https://github.com/Kickball/awesome-selfhosted has been an incredible resource