“So just do it” is a glaring one for me.
Simply because it is disregarding someone else’s thought processes and how their mind works. Where simply ‘just do it’ is not as easily and readily accomplished. This kind of advice is always uttered when one person is going on about how they’re tired of something and want to do something else. So this gets mentioned.
It could be a lot of reasons as to why, even if it is down to the obvious reasons. My valid reason a lot of the time is that I just don’t have the energy or will to just magically get myself to do something.
I try really hard to not downplay the environmental effects that played into my depression journey when I give advice for this exact reason. You’re right, it’s not easy to fundamentally change the way you think to such a degree that your hormones change. It’s possible though. But it’s probably gonna need a disruption in your environment that you may or may not be able to facilitate. I got lucky, and my disruption happened to me so my journey was helped a lot