Tips and tricks for remaining scheduled and motivated with unscheduled time?

I've always had a fairly structured routine life (clock in/out of work) and am able to stick to deadlines/routine in this format. There are only a few times in my life when I have more unstructured time and have to self-employ deadlines and things tend to fall apart during those instances (staying up late wasting time -> wake up late -> vicious cycle). I find when I'm held accountable to others (eg showing up for an appointment or a start time for work), things go fine, but when I'm only accountable to myself things tend to fall apart fairly quickly.

I'm sure many of you have jobs / hobbies where you work remotely and have to come up with your own schedules and am wondering what tips and tricks you've accumulated from your experiences that you would be willing to share that have been helpful for you to accomplish your goals?

I have a few months of free time coming up, and am hoping to make the most of it to improve my personal / professional life and make progress on my own personal projects/hobbies.

Some tips / tricks that I will be employing that have been somewhat helpful in the past:

• Creating a schedule for myself at least a day ahead
• Using time-blocking websites to block or temporize access to certain websites (I like coldturkey for PC)
• Minimizing distractions (putting phone on do not disturb / airplane mode), working in a quiet environment

Interested in what tactics you have all successfully employed in your own lives!