Starting over six years again after Ph.D. I graduated with Ph.D. in 2012 from SUNY-Albany College of Nanoscale Science and Engineering, with B.S. in Physics. Then I could not find a related job to this day.

In 6 years, I managed only to get two different full time jobs in entirely different fields, and they did not last.  I believe one of the major obstacle in my goal is that I am Deaf, and the employers do discriminate.

So, now I am enrolling into community college to try to get in an internship program in Computer Science/Engineering in Spring 2019.  One of my major defects was that I did lot of modeling and simulations on a platform, but without a computer program language (C++, for instance). Another major defects: the program was not ABET certified, did not have any undergraduate engineering courses (AutoCAD, statics, etc), exhausted references.

As I was working on this course of action, I realized that most college and universities tend not to admit people who has advanced degrees (both undergraduate and graduate programs).  Granted, the community college will provide me with additional training and coursework to cover some of the defects such as basic engineering courses, programming and possibly one more math course.  But how do I get back into advanced research and coursework, or at least do advanced research (postdocs generally requires recent graduate within 3 years)?
First of all, you don't need a job at most colleges, you just need one of them. So don't let a bunch of closed doors bother you. Many others are still open.

You can definitely still do postdocs. Some schools have strict rules, many others do not, treating it as a generic at-will employment job with whatever name the prof wants to give the role. I knew someone who came back to a postdoc after over a decade in industry (they left again in a few months for another industry job though). I know others who have stayed in the role for way too many years. There are also similar jobs with other names like research scientist that you can get in academic labs. It's kind of wide open if you are willing/able to relocate. Pick some big schools and monitor their job opening list. 

You can also take classes at many (perhaps all?) major public universities via some variant of an open university system, requiring little more than permission of the instructor (and some cash). There will likely be a limit in the number of classes you can take this way but it can get you started. Ace a few classes and you will have a much easier time moving to the next step. 

Lack of ABET certification is not a huge deal, by the way. It's a lot of paperwork and many universities don't bother with it. It's more important that the school is regionally accredited. Then we can trust (at least somewhat more) that you were actually taught what your transcript says you were taught.