I read your question.
From the text, it was conveyed that you continued to blame yourself and that you were feeling very painful.
The first thing I want to tell you is that when I read your sentences, I felt “you are a motivated person” and “you are serious about your work.”
The fool also worked for a company for a long time and worked with many people.
People who can't grow easily are those who don't have an awareness of the problem even if they fail, and think “I should finish it for now.”
You, on the other hand, are different.
I'm looking back on my mistakes, thinking about what to do next, and trying to make improvements.
That attitude is by no means futile.
So I think it's not “you're not progressing,” but “you're in the middle of progress.”
However, there was only one thing that bothered me.
Aren't you holding on too much at once, saying “we have to fix that too” and “we have to improve this too much.”
When people try to change a lot of things at once, they get impatient.
If you're impatient, you make mistakes in judgment, and if you fail, you blame yourself even more.
It can be repetitive.
So, let's start with just one thing.
“We'll be able to do just this today.”
Please make that decision and work carefully until you can do it.
Once you can do one, the next one.
That accumulation will eventually give you a great deal of confidence.
And please don't forget.
It's not that life isn't worth living because you've made mistakes over and over again.
People grow little by little because they are people who keep trying to get better even when they fail.
Don't be impatient.
Don't be in a hurry.
Your steps will never go to waste.
Gassho