1. The mew hero has no DISBTN. His icon becomes green on pause/F10. You can add or make such an icon:
Button Manager v1.8.2
BLP Lab v0.5.0
Complete Icon Tutorial - All About Icons
How to Make an Icon
2. You can train more than 1 hero per tier. Please check tier requirements.
3. Tactical Recall, maybe make that only teleport a max of 6 units and decrease the AoE.
4. So, you did not want to give them a tower? Maybe add another building to fill the remaining black square in the Build panel? Anything you can think of that would make things interesting.
5. Wormhole=Blink. Maybe you could modify at least one of the spells to be different in some manner.
6. Well, the other factions are going to have a hard time destroying the High Elf buildings with 10 Fortified armour on.
7. Feels as if the race is missing 1-2 units compared to the other factions.
Clearly an improvement. However, I'd really like you to make hero spells less Warcraft III clones. Just delve into the (spell) Object Data's fields and see what you can do with them so I can approve this until you can get some triggering for them.
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EDIT: That's all good but renaming original WcIII spells and changing their FX isn't really that nice. If you could change the spells more...
Example: Reincarnation. When the hero dies or is revived by the spell, something happens around him. Units get HP/mana back, or damage is dealt to enemies, something like that. You could do something similar with Blink.
Say, Frost Armour also makes a small Frost Nova on/near the unit it has been cast upon (maybe when cast on enemies or just your units?).
Healing Wave, well that's not easy to code with average GUI, so maybe you can find another spell to replace it, like the Scroll of Healing ability.
Critical Strike. Maybe something else happening when the chance is right instead of multiplying the damage.
If triggers are hard for you, you could always ask for help:
World Editor Help Zone