AGAIN, you're missing the point.
I'm really not. You asked for assassins to be as strong as they were 3 years ago, and i explained why that wouldn't happen.
There's actually no way we GET season 3/4 assassins back,
And that is what it would take to make assassins feel strong again. That's not going to happen so assassins will never be meta again. That's the hard truth of it, and quite frankly is the end of the conversation. You make a couple of funny comments though, which i can't help but respond to.
Assassins need to exist in the game whether you like it or not.
Diving fighters provide the same threat to immobile carries and their existence could completely negate the need for assassins altogether.
Grouping up and just smashing into each other is a boring strategy
Sounds like you want split pushers to be strong not assassins.
and assassins have always been a high risk and exhilarating playstyle
With the mobility that many assassins have they really aren't high risk, and getting instantly deleted when assassins are meta isn't exhilarating at all.
that quite frankly belongs in a game where squishy ranged damage dealers exist. They just have to exist, or else someone will MAKE them exist (Full AD Pantheon, Lee, J4, etc.)
The examples you gave are all divers, because they can't get out of fights the way assassins can, and they actually have to commit to fights instead of lol-nope-ing out of their own engages if something goes wrong. Those divers have to take intelligent fights or else they are screwed unlike zed or leblanc with free blinks back out of fights. The mobility profiles of panth, lee, j4 make them fundamentally different from assassins, and with that distinction they don't suffer the same game health problems that assassins create.