To put it simply: you can't.

Slight elaboration: don't be a try hard.

A more grander explanation: you need to stop forcing Alexander onto others like an aggressive salesperson. That kind of tactic only really works with people who are already desperate for interaction and I'd like to think we're doing quite well on that department.

I don't know if you realize this, but it feels a lot like you're trying to put yourself at the center stage. All this stuff you want to happen, you want Alexander to accomplish and everyone else is suppose to help you. It's rather off putting to play second banana ya know?

I don't want to talk about myself but since it may come up I would say that what I'm doing with Malakaus is different from what Alexander is doing. While admittedly he has minor nobility to give his words weight, he's not forcing his quest onto others. He seeks worthy or interested individuals and, without trying to make things more dramatic or make himself more grandiose than he isn't, asked them if they're interested in his quest.

And to be fair you're coming on rather strong with the whole "let's return to our real world" sticht. Yes there are other worlders here and they may be confused and want to go home. But trying to open up with "Hello I'm from another world can you help me get back" makes Alexander sound like a crazy beggar. Another thing: just because most everyone who's an otherworlder is probs Japanese, there's nothing wrong with using Japanese terms. Sure it's not of this world, but at worse it's just foreign. Which isn't even that bad aside from certain characters who may be racists or xenophobic, which there may be.

Tl;dr: don't be a weirdo. Just go get a job with the Iron Bell Knights and work on getting back to your original world as a sort of personal project.