Major mistakes made in assembling your audio rig


What types of mistakes (in your estimation)did you make in assembling your audio rig over the last 5 to 10 years??

For example,...."I should have spent more money";

"I leaned too heavily on reviews and/or the advice of others";

"I should have just stuck with separates and not downsized??"

"I just can't get the thing to sound the way I want despite much time and effort"

Based on any or all of the above.... Have you ever considered selling your system and starting over, or concluded, it takes too much time and money, and is a hassle.... so regrettably I quit
sunnyjim
Selling a 401 for $75 and my folks throwing away a 301 and Grace 707 and my 10 tube home made tube phono preamp along with a box of Mullards, Teles, Brimars and Seimens tubes.
Not upgrading my speakers sooner. In my defense, they were DIY speakers that I built with my mom, so they had sentimental value.

But I was spending money on accompanying gear that would have had much more impact on the sound if it went to speakers instead.
Can honestly say I haven't made many mistakes the last decade or so.
The system sounds wonderful , I'd be hesitant to change anything.
We can always look back and say, I should have went one more step up when I upgraded this or that, but then what would we do later ?