Hello....hello....hello.... How to avoid an echo chamber.

We as humans want to be excepted into the fold and because of that we will bend our beliefs or morals to fit in to the crowd. Over time that crowd can actually totally change our belief system without us even being aware. The MSM do this all the time. That is the number one reason everyone needs to stop watching the lies the spew.
The best thing you can do to keep yourself free of echo chambers is to increase who you get information from. Always keep new ideas and people flowing into your system. You will question things you have been unsure of and actually take a stand on one side or the other. This is very important, if you are unsure of what you believe you can easily be swayed to wrong think. This was a huge tactic used by the Nazi's. They would have your neighbors gather and speak their trash and if you did not agree you were a traitor but if you were unsure you soon took on their opinion. Think for yourself.

Oh very well said, thanks so much, such truth and its refreshing!