Don't feel bad if it's not selling that great. Unfortunately, insofar as I'm aware, while there are some changes that are nice and don't scale horribly or the like, most of what I've seen of the newest iteration makes me more likely to homebrew or stick with 5e with tweaks as needed. Not enough innovation or streamlining in positive ways to make it worth the (for me) 5th reinvestment, discounting online media. I understand your struggles.