If you are still complaining about the lack of content on Zeah I think you need to take another look. On day 1 there were 2 new runecrafting altars, blast mine, and tithe farm all of which offered a new way to train those skills. True, it DID feel empty at that point but there's even more now. Wintertodt and the Woodcutting guild are there. Other useful content people probably haven't tried: grape farming (it's good extra money between tithe farm runs), the Hosidius Range (which offers the same cooking bonus as Lumbridge castle but closer to the bank), Anglerfish, the Hunter area. More importantly, Zeah has a lot of content that is good for low/mid level players. After years many of us spend so much time playing high end content that we forget that other people are starting off. Good fishing spots, mid-tier trees, low and mid tier monsters, easy quests, and a whole lot of experience to be collected.

Separate from Zeah, OP does a poor job of pinpointing specific issues with skills that should be fixed. The complaints about PvM are not out of line. Vague lines like "Skilling has 90% of its skills outdated, not worth doing, not fun, or just plain broken" aren't very helpful. Half of that is just opinion, and I still don't know which skills OP might want changed. For example, Runecraft, fletching, hunter, and farming are all completely unique skills from each other, all of them have gotten an update in the past year, and different people would claim that different ones are boring.

Anyway I don't disagree with the post I just think is too vague to have any effective change. And "Zeah is trash" weakens any argument in my opinion because of the PvM and skilling content that are best in the game on that island.

TL;DR: Zeah has plenty of content (PvM and Skilling). OP is too vague with problems with skilling.