I think opinions differ on this and obviously depend on how you define success. I personally can't get the kinds of reads and comments on any of my stories that you get normally even with a boost! So, I guess that means I could learn something from you. Maybe I need to focus on that value element, rather than just whatever is on my mind, or whatever takes my fancy from my stock of articles.
I am impressed by your success, always, but also feel sad for your troubles. It hasn't been easy has it. You deserve to do well, to help you on the road to recovery, and to support your favourite charities when this cancer shit has gone away.
But no, before boost, the occasional story went viral. Now they seem not to. It's like boost quashed that. Boost now determines virality, or not. Honestly, I think I preferred the old system.