5. Do the right thing.
When you do what you deep down think is the right thing to do then you raise and strengthen your self-esteem.
It might be a small thing like getting up from the couch and going to the gym. It could be to be understanding instead of judgmental in a situation. Or to stop feeling sorry for yourself and focus on the opportunities and gratitude for what you actually have.
It is not always easy to do. Or even to know what the right thing is. But keeping a focus on it and doing it as best you can makes big difference both in the results you get and for how you think about yourself.
One tip that makes it easier to stay consistent with doing the right thing is to try to take a few such actions early in the day. Like for example giving someone a compliment, eating a healthy breakfast and working out.
This sets the tone for the rest of your day.