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I don't know if this is relevant to your interests or not, but if you do a bit of reading about trigger points and get yourself one of these, it may greatly amplify the helpful effects you describe. (+make it possible to reach parts of your back/neck/shoulders that you otherwise wouldn't be able to.)
It makes a huge difference - it has for me at least - but I can't stress enough, that it helps to learn about how the muscles go together + where the relevant points are. Otherwise you'll just be jabbing yourself aimlessly. Because what might feel like the "sore spot" may just be referred pain, and you could unlock further improvement by addressing the originating points instead.
There are books on the subject, and plenty of massage-therapy-related things, but a good visual reference and tl;dr is this app (Muscle Trigger Point Anatomy) which shows you the places to address, the affected areas, with accompanying anatomical descriptions.
For whole-body care and maintenance it's something I definitely recommend (in addition to exercise and other healthy stuff, haha.)