To maintain a good attitude and high self-esteem, evaluate and follow up only after interviews that were positive experiences.

false

you should follow up on any and all interviews whether they were positive experiences or not. an interview you see as a negative experience, may not be so in the eyes of the interviewer. this could with a good attitude and self-esteem as well. also, being able to take the "high road" or be a good person in the face of negativity can also to build esteem.

it is an infinitive phrase with a subject.