I have two small suggestions which require minimal resources.
The first suggestion
Change the rate of the Goblin that changes the cards from 10:1 to 3:1
In the current year 2022, 95% of the omen gear is obsolete, most of us use OMEN to make money, unfortunately the nyame set is too powerful.
The Goblin that changes cards 10:1 ratio made sense before odyssey. At present it would be a good idea to change the ratio to 3:1, so people could get the few omen pieces that are still attractive especially for jobs that can't solo card farm.
The second suggestion
WHMS alter egos use up all their MP incredibly fast because of CURE 6. Removing this spell and just leaving them with Cure 1, 2, 3, 4, and 5 is the easiest solution.
Many of us players prefer to use RDM as main healers, since WHMs are so bad. They spend their MP explosively and don't know how to conserve their mana, making changes to the AI's behavior would be "expensive" and "time consuming"
Cure VI spends 227 MP and those "Bots" love to spam this spell even if you have yellow-hp. Removing this spell from their list would force Alter-EGO WHMs to use CURE 4 AND CURE 5. Their mana would last much longer and they would be more viable.
CURE V spends 135 MP, CURE IV spends 88 mana vs CURE VI's 227. Both spells combined are 223 mana.