It’s just a suggestion, if you’ve already started DS9 I would just stick with that tbh.

Basically two reasons.

First, DS9 is straight up better. Peak Star Trek in my opinion, so it’s nice to end on a high note. Again, not that VOY is bad or anything, but if DS9 is 10/10 Star Trek VOY is more like 8.5/10.

Second reason is world building. Really there isn’t that much overlap as far as specific parts of the story is concerned, it’s more that DS9 is so great because it turns some things that are taken for granted on their heads. VOY is useful because it kind of goes into that direction a little bit, with the conflicts that necessarily arise on a small ship far from home, and because you literally just learn more about the world/universe, whatever you want to call it, and the more context you have the better DS9 gets.

Very minor spoiler, both shows feature conflicts with the Marquis and the contrast, as well as the lack of contrast on how these conflicts are handled is very interesting.

I would at least touch on VOY, it needs a bit to get going, just like TNG I suppose, but it’s solid. And the big, big payoff is watching DS9 after that. DS9 is fantastic, but it only gets better with the context from VOY and TNG.