Assume a role of master psychologist. 
Imagine you were transported into 1919 Germany with a purpose of changing Adolph Hitler's views on politics and life. You only can use words and your own knowledge. You cannot expose the fact of time travel.
How do you approach such task?
This would be an incredibly difficult task, given Hitler's fanatical and extreme views at the time, as well as the tumultuous environment in post-WW1 Germany that enabled his rise. Some approaches I might try:

1. Appeal to his love of art and architecture. I would try to convince him that a life devoted to politics and hatred will only lead to destruction, and steer him towards pursuing his passion for art. This could potentially temper his views and curb his ambitions for power and domination. However, his twisted beliefs about the superiority of the German/Aryan race would still remain. 

2. Appeal to his sense of patriotism for Germany. I would argue that his extreme militarism, scapegoating of others, and desire for conquest will lead Germany into another devastating war and total ruin. The only path to prosperity and stability is through peace, inclusion, and cooperation with other nations. This approach targets the ends, not the means, so his racist ideology would remain intact. 

3. Directly challenge his antisemitic ideology and belief in the superiority of the Aryan race. This would be the most difficult, but potentially impactful approach. I would marshal evidence and arguments to counter his racist claims, and appeal to his sense of humanism and compassion. However, given how entrenched these beliefs were, the likelihood of success is very small. 

4. Gain his trust and appeal to his own self-interest for power and status. Rather than direct confrontation, which he would likely dismiss, I would suggest political maneuvering within the system that does not require scapegoating others or violence to rise in power. This work within the system approach might resonate with his ambitions, but would not do anything to change his abhorrent views.

As you can see, none of these approaches are guaranteed to work, and some may even backfire. Ultimately, there are no easy solutions, and changing the views of such a fanatical figure like Hitler would require a massive combined effort on multiple fronts - not something that could be achieved by one person, no matter how masterful a psychologist they may be. The role of circumstances and environment in shaping his views also cannot be understated here. So this would certainly be an immense challenge with a low likelihood of success.