If you haven't already I would suggest reading Stephen Hawkins book "a brief history of time" as it tackles a lot of these concepts

If you don't have any advanced physics qualifications or mathematics (I only say this because most people don't) it's quite information dense, so you'll want to chunk it up. I hugely recommend when I found it hard to grasp the points to watch some YouTube videos about it. Especially with things like additional dementions, YouTube was unreal for helping me visualise things better.

The concepts get progressively more challenging as the book progressed I found, but it's informative throughout.

In reality, the universe that we can observe is expanding significantly faster than we can travel, even if we could go much faster than now.

Even if you imagine the universe is not infinite, it's functionally infinite from our perspective.

There are conflicting models of how we can have an infinite universe, that is also expanding (that bit always hurts my brain). So we don't know this for sure.

Essentially to quote the brilliant Douglas Murray "space is big. You just won't believe how vastly, hugely, mind boggingly big is. I mean, you may think it's a long way down the road to the chemists but that's peanuts to space"

It's most people who want the scientific discovery aspect. As well as probably lifelong recognition to some degree.

But even with those, it'll be hard to get people who fit the description well