Learn English – a better way of saying “I am in right way?”

In this specific example, "... get more out of..." means that the person will gain a greater understanding - learn more - from their studies after the trip. Literally, they will "get more [learning] out of" the studies than they otherwise would have. To me, it implies that the person is traveling, and believes that having actually been to other countries and met other people will assist them in their studies more than simply book learning would have.

Another example might be: "I will get more out of my workout because swimsuit season is coming." The person knows they want to lose pounds fast, so they are motivated to do more.

The formal and polite way of saying a vulgar expression is usually to avoid using any expression and just use regular words.

So, depending on the context of what the other person is expecting from you, one of these might work:

"I'm not going to blindly agree with everything you say."

"I'm not going to emulate you."

"I'm going make my own decisions on how to proceed."

"I'm not going to flatter you."

"I'll speak in favour of whatever course of action I think is best, which won't always be the one you support."

In short, speak directly to how you are not going to fulfill that person's expectations, or what you perceive are that person's expectations.