What are steps to build positive self-esteem?

There is no secret to it. I will enumerate all of them here, you may have your own that's totally fine. Some of the strategies are - Turn your weakness into your strength; Become internally driven, not externally; Have patience; Practice discipline; Network with people of high moral character; Set goals; Do something for others without expecting in return; Make a list of all your strengths and weaknesses; Be credible to yourself. 

These are only a few them, use the KAIZEN technique so that you become habituated to it. After reading try to implement it because knowledge is not power but potential power and does not gets converted to kinetic power until you use it. Use yourself and tell others about it, that's how you lodge it in your subconscious mind.

Everything you have negative thoughts on your mind, flip them to positive ones, and wonders will happen. Have a great day ahead!