Here are some changes I could think off the top of my head:
1.Hero speed bonuses should apply to the hero itself as well (Mainly for the Seleucus speed issue)
2.The Kushite eco pyramids should have 75 metal and stone cost in p1, 10-15% less build time but reduced 10% bonus. in p2 the pyramids should be 100 stone and metal and give 15% bonus and the build time in A27. alongside this, the range of the pyramids should increase from 40 in p1 to 55 in p2 (an option to upgrade the p1 pyramid should be provided same way sentry towers become stone towers)
3.return archers to a26 state for testing right now, and see what changes are needed after that
4.make the Ostracism tech cost 200 metal
5.Reduced time for construction of Gymnasium in p3 compared to p2 (15%)
6. Increase required exp for City Guards by 15%
7. Reduce Alexander's health by 15% on account of literally being the strongest hero in game right now
8. Make Phillip of Macedon's bonus related to phalanx formation/pikemen for historical accuracy
9. Make all elephants 10% more metal than they do rn in A27
10. Reduce size of all elephant stables (Currently feel too big for medium map size bases let alone normal) and added reduction size of Kushite, Carthaginian, Ptolemic Elephant Stables (smaller elephants, why same size ele stable?)
11. Let Mauryan Civic Centre garrison all types of elephants
12. Give Bindusara, Chandragupta Maurya (infantry version), Xenophon, and other heroes left with no bonuses ATLEAST SOME bonus for regicide gameplay. Also, Increase speed of Xenophon (currently equal to a female even though he's a jav inf)
13. Make Champion cavalry (especially cataphracts) slower than a jav cav, but increase acceleration by a bit
14. Remove bamboo palisade as a buildable structure for Hans in Suvival of the Fittest map (no other civ is allowed palisades or walls) (DONE)
15. ADD HAN SWORD INFANTRY
16. Add Spying tech that allows to locate enemy hero in Regicide games
17. Elephants should Garrison inside Forts as well
18. Add Kushite Chariot Archers to the game