Welcome to the forum, Robert. First of all, it’s usually not a good idea to go to bed at a set time. You only want to go to bed when you feel sleepy enough for sleep. A clock doesn’t know when you are sleepy!
With that being said, it’s a good idea to observe a regular (and appropriate) sleep window — and this will involve having an earliest possible bedtime. If, however, you aren’t sleepy when your sleep window begins, it’s usually best not to go to bed until you do feel sleepy enough for sleep.
I see nothing in your post that makes me think that CBT-I techniques won’t be helpful for you. You might find it helpful to make sure you are implementing the techniques correctly, then focus your attention on implementing the techniques rather than monitoring for results.
As you rightly pointed out, just as it took time for your insomnia to develop, it will take time to get your sleep back on track.
If you stay committed and consistent, I am confident that you will see improvements in your sleep.
At the current time, one of my favorite books is The Effortless Sleep Method by Sasha Stephens. I also recommend Overcoming Insomnia: A Self-Help Guide Using Cognitive Behavioral Techniques by Colin Espie.
I hope this helps.
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