The first Mission Impossible movie is a fun time capsule in many ways. It has some fun stuff with early 90s depictions of computers, hacking, the internet and email, back before anyone knew what any of that actually looked like.

But it's also a great example of the 90s naivete that the US had about conflict and global politics. There's an entire monologue about how intelligence agencies are obsolete because the cold war is over. There was this vague notion in the 90s that world peace had broken out and things were just going to get better and better. And Hollywood sometimes struggled to come up with villains now that they no longer had soviets for that, so you don't see it reflected as much in films, especially since optimism doesn't make for good popcorn flicks, but Mission Impossible captures the thinking if not the warm and fuzzy feeling.

My other suggestion would be Contact. My theory has always been that 2001 A Space Odyssey, Contact, and Interstellar are really the same movie made in different times. As the 90s incarnation, Contact has no international conflict, only internal politics. It's got that I'm spiritual but not religious" vibe that was everywhere in the 90s. It has a vague message about hope, and belief and trying to understand the universe and what's out there in order to understand ourselves... it's hard to put it all in words, it's just the whole tone and vibe of the thing, it's all just so sincere and idealistic.

(For a great big dose of 90s optimism and hope for the future, I highly recommend watching the Adventures of Brisco Country JR. I'd have nominated that, but it isn't a movie)