Everybody hopes for some simple trick that will make all their problems go away.  Avoiding gluten, avoiding blue light, keto, etc, etc.  Most of these interventions have no effect on most people.

And even a major intervention like a CPAP machine isn't curing my daytime sleepiness!

When I think back over my life, only twice was there a simple fix for something:

1) losec cured (or at least put into longterm remission) my many-year-long perma-heartburn  (it probably worsened my IBS though)
2) athletic tape cured my longterm plantar fasciitis.  Yes, $4 of tape beats $400 orthotics every day of the week.

So it is possible for "one simple trick" to work, but these are rare things.

But if you have a story of a simple thing that made a world of difference in a longterm way, please share.