So, I've been thinking for a long time about what made the Original trilogy such a watershed moment; why did this story resonate so much when none of the subsequent trilogies or movies have really captured that same spark (and I now have the enforced spare time to set these thoughts down).
What I've come to is that the OT is a story about three worlds colliding:
The world of the Force, with Ben and Yoda and Vader and the Emperor, with Luke caught in the middle.
The world of Politics, with Leia's Rebel Alliance versus the Empire represented by Vader and an army of faceless troopers and increasingly irrelevant officers (everyone remebers Grand Moff Tarkin, some people remember Admiral Piett, and nobody remembers Moff Jerjerrod).
And the world of the Fringe, with Han, Chewie, and Lando versus the likes of Jabba the Hutt and Boba Fett.
Note first that each of these worlds has its own internal conflict (Light Side/Dark Side, Alliance/Empire, and Han/Jabba) --each of which could carry a lesser movie, but this trilogy is about these worlds colliding and getting mixed up in each other, mainly through the actions of our three protagonists:
Luke, most notably, starts out on the Fringe ("If there's a bright centre to the universe, you're on the planet that is farthest from"), then joins the Rebellion, then leaves the Rebellion in ESB to begin his Jedi training (then returns in RotJ, only to leave again a few minutes later to take care of more Jedi business).
Leia starts out carrying the fate of the entire Rebellion on her shoulders (and searching for a Jedi, specifically to drag him into the fight he's been sitting out of), but by RotJ she's pulling off unsanctioned ops with Lando and Chewie while scoffing at high-priority Rebel missions, willing to let someone else carry the entire weight of the Rebellion.
Han starts out firmly on the Fringe ("I'm not in it for your revolution [...] I expect to be well-paid"), but by RotJ is a Rebel General, taking on the exact same kind of fate-of-the-Rebellion missions Leia once did.
Note that being able to walk between worlds is the mark of the Trickster Hero archetype, and it's these exchanges that end up resolving each of these internal conflicts; Luke destroys the Death Star not by being a hot-shot pilot, but by being a Jedi. Han (a smuggler-turned-general) and Lando (a con-artist-turned-politician-turned-warrior) are the ones who kill the second Death Star, and former-Senator Leia Organa is the Hutt-slayer who ended the mighty Jabba and threw the criminal underworld into disarray.
None of the villains cross between world like this, with the single exception of Vader himself. The first time we see him, he's acting as part of the Imperial war machine; a soldier taking orders from a ranking military officer, but already with a link to the Jedi, given his vendetta against Kenobi. In ESB, his position has changed; he's no longer a military man, but a mystic, genuflecting in front of his master. It's Vader who calls in the bounty hunters (despite the Empire's official stance of not needing such "scum"), makes (and alters) deals with local businesspeople, and even generously offers to comp Fett for his expenses. In RotJ, Vader flip-flops between military go-between and Dark Jedi, relaying the Emperor's orders to subordinates even as he expounds on the power of the Dark Side. This adept walking between worlds is a subtle clue indicating that Vader isn't like the other villains in this trilogy; he still acts like a thematic hero --confirming for us that Anakin Skywalker was still in there somewhere.
(Note that, for all Palpatine is called the Emperor, we rarely if ever see him actually interacting with the Empire. His presence strikes fear into his subordinates, but in the OT, the only people he actually speaks to directly onscreen are Vader and Luke. The only time he speaks to others is when he tells the guards to leave. Even when Jerjerrod is standing right there, Palpatine doesn't even look at him.)
None of the Prequels/Sequels have really captured this: the Prequels came close with Anakin (going from slave on the Fringe to Jedi Knight), and the Sequels with Rey (again, going from Fringer to Jedi), but none of them really centred the world-walking Trickster Hero archetype. All the transformations we see in those movies are still within context; Padme goes from a senator to a warrior and back, but remains ensconced in the political realm, and Finn just goes from a soldier for the First Order to a soldier for the Resistance.
The only other world-walking Tricksters in Star Wars. . . are Ahsoka, Kanan, Ezra, and Sabine.
Ahsoka and Kanan both independently go from Padawan to ronin/smuggler/civilian to rebel and back to Jedi (ending up as better Jedi because of it). Ezra was a street rat who joined a rogue band of rebels and then became a Jedi nomad. Sabine has been a soldier all her life (first for Mandalore, then the Empire, then the Rebellion), and is now (in Ahsoka) taking her first steps toward being a Jedi.
(Notably, there were elements of this to Thrawn in the EU, with his artistic awareness, tendency to use disguises/misdirection, and his academic study of the Force and its associated beliefs [even if not a Jedi himself, he made it a point to understand them] --which is why he became such a one-of-a-kind villain in the first place.)