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I know enough physics to say no Even inter-Stellar is out of our reach (without generation ship).
We have zero reason to believe in an effective way to build wormhole, jump gates or anything similar. Even high energy cosmic rays have a limited range (due to collision with photons) which is a strong clue that there is no shortcut in space
But doesn't the generation ship / cryogenic technology / nuclear technology make intergalactic travel possible (albeit very slow)?
Sort of - but there is no reason to think we will ever be able to make something that won't break. Even intersellar is questionable just because the odds of the ship breaking in the time needed are too high.