I am trying to raise my self esteem too. I have tried therapy and CBT and they have helped to some extent.
But I think it comes down to this. If you have low esteem then for a long time your brain has been telling you - I can’t do this, I’m no good at this, this will go wrong.
This is an automatic thing and causes the brain neurons to fire and go down a well worn route. Recovery means each and every time you find yourself in this pattern, you have to stop yourself and tell yourself the opposite.
This can be exhausting and why they say therapy is hard work. The brains that fires together, wires together. It would be like if you had to think “breath” before every breath you take, it’s hard to keep it up.
I have found constantly reminding myself to question these automatic thoughts becoming more ingrained. I have also found finding mantras helpful.eg I want to be the main character in my own life etc. Sometimes it’s about thinking more about the person you WANT to be and acting like them. (Acceptance and Commitment Therapy). One therapist advised standing and adopting a powerful pose when thinking this.
I think a big forward step for me was realising that although my childhood and marriage caused this, it was now my responsibility to own it and let go of blaming others.I had to stop giving power to them and take it for myself.
There also a thing called Locus of Control. You have to move from thinking that things happen to you, to thinking that you can make things happen.
There are many good suggestions above. Keep reading and learning, here and there you will find things that resonate with you. You have to change the way you think, before you can change your behaviour.
As I said it’s really hard work and slow going. I am thinking of trying EMDR next as I’ve heard good results.