I've noticed in general that a good place to look is in the therapies that are used in treating personality disorders, people with eating disorders, C-PTSD, PTSD, and trauma. Right now that's DBT for emotional regulation, but for the trauma itself, EMDR, somatic therapies, motivational interviewing, and things like Internal Family Systems therapy. CBT DOES NOT WORK for this population. DBT has been proven as well as EMDR but the other things need to be looked into further. A lot of these share biological tricks (the eye movement and work with your body) and the rest of them have borrowed things from mindfulness and work on radical acceptance and dropping judgement rather than overrationalizing. CBT at its core is constantly causing you to overthink and judge your own actions which is not something you want to do to someone who's already doing that.

CBT doesn't really stand up against severe mental illness, so why should we expect that it's good for the average person who's suffering from some mild depression and anxiety? We have gold standards that can help people who suffer from some of the most treatment resistant forms of mental illness. Someone with severe CBT who responds to say, IFS after 20 years, you know that's not a placebo. This stuff needs to be studied more drawing from what we know about the populations who suffer the most, because we know that's not a placebo effect or a one off when we see people go into remission.