New player(crucible) Shaper help

Congrats on the win!

If you've never beaten the regular Elder (not "Elder in the Shaper's realm," which is Uber Elder), he's SUPER easy. Easily the easiest pinnacle boss. All you gotta do is bring down his first phase, then the rest of the fight is just him sitting still and spawning adds. Maven requires that you get good at her mechanics. There's also Sirus (a lot of people find him harder than all previously mentioned) though he's technically not part of the main story.

I wouldn't worry about the Ubers (Uber Elder isn't an Uber as there is Uber Uber Elder haha). Your build is light years away from beating them.

Congratulations on joining the 4%.

I must say though that all pinnacle boss fights (excluding guardians and elderslayers) are about understanding their mechanics. Watch loads of videos so you don't go in there blind and waste your fragments.

They are not meant to be tanked except builds that are specifically designed to tank them but those builds are normally very expensive to assemble or have very low damage and bad clear speed. There are also mechanics to punish players for dragging the fight too long such as the ever-increasing number of degen spots, so those tanky builds must also have means to be resistant or outregen the damage over time.

For example, if you have no clue about the mechanics in Mastermind fight, you'll just be stuck there in the arena forever.

Most of the mechanics are more obvious and fair compared to rares with certain combination of lethal mods. But there are less obvious ones such as the rifts in Uber Elder fight spawning the octopus, which spits degen spots on the ground, dealing massive damage over time. Hence, why you see on videos, players would rush to destroy the rifts ASAP.

Congrats, you are a lot further along than most.

This is part of what PoE is about:

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when I discovered in PoB that increased dmg additive and more dmg multiplicative, which is not explained ingame, it really helped me grasp which is stronger 40% increased dmg or 20% more dmg, and it was a breakthrough enabling to go above 1M dmg.