I can't speak about pillows (other than I prefer a very firm one) and I'm skeptical about any marketing hype that says "this pillow" or "that mattress" will fix whatever hurts.

Back when I was late 30's had a neck which would become very sore at time.  I grew up in a family which didn't trust chiropractors, but finally went to see a college housemate who was one.  He said I was orthopedically okay but gave me some neck (and back) exercises to do.  The improvement was quick and astonishing.

I just searched for "neck exercises", and what came up was what the chiropractor had me do.  That is well I would suggest you start.

Have you stopped using the tech that caused the problem?

Well I use a smart phone still but plan on getting a simpler phone later down the road but for time being, no.