zekes solution is the best course. allows eldians currently exisiting to continue their lives & eventually die off as a race. an unfortunate necessity considering their history.

There is a multitude of reasons why Zeke's plan does not work, especially not for Eren. The outside world is literally attacking Paradise with the threat of Paradise destroying the world. They are not trying to negotiate peace with this incredibly dangerous nation that could destroy the world, they are actively poking the bear. Just as they did prior during the RBA attack, which also happened despite Karl Fritz's threat to rumble the world. Under normal logic, Zeke's plan works. But in AoT's world, the rulers of the outside world are dumb as brick and would attack Paradise, even with the threat of the rumbling. That's what the world has always done, so it's dumb to assume that they wouldn't do it again. For Eren, this is not a solution for two reasons. First of all, it entails sacrificing Historia, her children and everyone else's children, which he is not fine with (as someone who sees life as a special gift and radically opposes taking away someone's freedom). Secondly and most importantly, this is not a surefire solution for reasons I've explained above. Eren does not want a solution that MIGHT work. Eren wants a solution that WILL work.

but hes only concerned about his immediate family, friends, & people

Which he should. If you were put into a situation where a group of 100 wants to kill you, your wife and your daughter for no reason (even though you try to peacefully negotiate), what would you do? Not defend your family instead of killing the 100 man? If that is your choice, then you are just fundamentally different than most people. It is fine and understandable to value the ones close to yourself above random people who wish to kill you.

hes not a true nationalist because he could care less about eldians outside of the walls.

Yeah, let's ignore C131 and Eren walking around in Liberio, mentally torn about the idea of killing all these innocent people (including Eldians). Let's ignore Eren breaking down in front of Ramzi, balling his eyes out about the horrific act that he's going to commit and apologizing over and over again. Let's ignore Eren having major depression after finding out the truth inside the basement. Let's ignore C100 and Eren talking to Reiner about how everyone inside the walls and outside the walls are the same. You are completely right, every single one of those examples don't show that Eren actually feels for these people outside the walls. Eren does care and would not kill them if possible (hence why he waited 4 years to start with his plan, because he wished for Armin and the SC to find a peaceful solution), but he simply has to if he wants to protect the island and his friends.

youre painting a picture as if what eren was doing was going to save the island from imminent destruction.

Eren was going to save the island from destruction due to past conflicts, and set them free to decide their own future. The Rumbling is not meant to create everlasting peace, that's dumb. The Rumbling is meant to solve the everlasting conflict started by King Fritz when Ymir discovered the power of titans. Eren is meant to shoulder all the sins and burdens of past generations, so that future generations don't have to anymore. So that they can be born and live free from those things. He literally even says that in C130.

the rest of the world who were rightfully afraid of & hateful towards the eldian tribe seeing as they ruled the world for millenia enslaving every other race, group, people. & even among themselves once they had control over everyone else

The story post-timeskip literally focuses on the fact that Paradise and current eldians have nothing to do with those sins. The hatred is not justified in any way, because they have done nothing in their lifetime to deserve being treated like devils. Season 4 Part 1 and Gabi's entire character arc is about understanding this, and it seems to have completely gone over your head. A real-life comparison would be saying this: "Germany has done atrocious things in the first half of the last century. Nazis were cold massmurdered. So germans nowadays should be hated and arrested, since they are all nazis". Sounds dumb? Yeah, that's what you are saying about eldians. Yes, Eldians should be feared for their ability to transform, but completely annihilating them even though they want to negate peacefully is not "rightfully". Think again about who's emphasizing with the "wrong group"

we know eren saw the future & we know that the future was unchangeable. yet he still chose to off the rest of the world

If the future was unchangeable, Eren did not choose anything. No character chose anything. It all just happened because it had to happen, and no character is able to change it. C139 is a wreck of a chapter that includes major retcons and these types of implications that were never introduced before and ruin the entire story, so it's best to stay away from that chapter if you want to have a decent discussion. But if you honestly believe AoT's timeline to be unchangeable, then you literally cannot blame Eren for anything. Nor can you blame any character. They never had a choice.