First off, what is LinkedIn and what is it good for? (In my opinion) LinkedIn is a self-maintained directory of businesspeople. It is (reported to be) making most of its money by selling access to that directory information to salespeople and recruiters. Right now, LinkedIn has been sending me email after email trying to get me to take a course or take some other actions "to help me find my next job." In short, my experience is that it wants to package me up and sell me to a recruiter.
I have heard many a pitch to use LinkedIn for networking. The person I knew who pushed that the hardest was unable to use the thousands of connections he had to make enough sales to stay in business and he shut down his business and got a job.
Electronic networking is not the same as face-to-face networking. It can augment f2f but can't replace it. Currently, in a large city, f2f networking is far more productive than any electronic networking, LinkedIn or other.
You don't want salespeople contacting you. Recruiters want someone who fits a specific profile, has specific skills, and is able to be placed in a job without any training. You want to know how to change careers. That is not what a recruiter wants to hear.
At this point, it sounds like what you need is to find and hire a career coach who can guide you in your life change. That is something that you can use LinkedIn to find. Trying to use LinkedIn to find someone who can do that coaching for free (which is what your questions sound like) is likely to be a futile effort.
Eventually, you may need to take a leap and physically move to a new place in order to start a job search. Once in a place where face-to-face networking can be done, you can use such to help find the job you want.