What do you do to get motivated to work hard when you've had some setbacks?

Less motivated because they (bosses) are not treating me as well as others.
Update: Why are they not treating me well? It could be related to disability. It may be my race or gender. It could be something they have misinterpreted or misunderstood. I can't know why and they don't seem eager to tell me, but there's definite mistreatment.
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