What do you think about aliens?

[AFTT47]

It is just to me, more reasonable that even if we find it, it will be stuck locally where it is at like we are.

Nope. New physics is not required for practical interstellar travel.

Google, "stellaser". It's a way to build a huge-ass laser directly powered by a star. No new physics required. One of these could push a spacecraft with a huge solar sail to at least 10% of light speed. You would send a robotic probe ahead of you to build a stellaser at the destination for slowing down.

You might think that's still too slow but not with life extension or for beings that have self-evolved into immortal machines.

Most sci-fi depicts interstellar travel using (as far as we know) non-obtainable tech because it is most convenient for good story-telling. The reality is that none of it is needed. There are multitudes of solutions to interstellar travel which are firmly grounded in known physics.

Any intelligent life form that has the desire to travel to other star systems will have the means to do this eventually. It's just a matter of time to develop those means.