Here are some of the modification to the base game that I made. If you have more idea, then comment down below and I might just add your suggestion here.
1.Lowered the amount of Primogem needed to pull and increased the chance to get limited character to 75%
2.Weapons Banner now features Standard Banner 5-Star weapon that you can choose.
3.A video section for teaser, demos, music, and maybe even fan-animation.
4.No time-gated domains
5.Unlimited Trouce Domains attempts
6.Other NPCs dialogues changing such as acknowledging the Traveler's achievement and showing fear when being
confronted depending on certain requirement.
7.Events are archived along with all their rewards. (Pls Hoyo)
8.More varied wildlife.
9.A more in-depth fishing and also adding hunting and also adding the ability to sell them.
10.Much more detailed NPC models.
11.Added injuries/blood. (not too graphic)
12.Actually moving carts and boats.
13.Shops opening and closing depending on the time of day.
14.NPCs actually going back home when its nighttime. (Except drunkard and others.)
15.Friendship system similar to ZZZ
16.Added the ability to change clothes after completing the nation's Archon Quest.
17.Able to swim underwater for a short period of time in other nations.
18.Interactable object for looting. (Bags, storage container, etc.)
19.Much more varied commissions.
20.No commission-gated quests.
21.Random encounter while adventuring which gives materials and 5-10 Primogem.
Example:
NPC vs NPC.
Travelling merchants.
Patrolling Knights/Guards.
Other adventurers needing help.
Wild animals including wolves and such.
Other playable characters. (duh)
Roadblocks.
Ghost/Supernatural stuff.
Other hunters and fishermen.
And much, much more. Basically, any open world game with the same system except the encounter are actually randomly generated real time and is not already made.