I know for most people these still won't be enough for them to really like VIP but here is some minor enhancements
1) Double Roll on Daily/Weekly taking the better of the two or A VIP bonus that adds +10 to roll. Possibly each time stacking until they hit 100 and it resets.
2) Free Chest Reroll - One time per chest
3) Increased bank space Like either +20 slots of shared, +10 of character or x2 space. If VIP is ended, the items go into an overflow and automatically fill any empty slots of the bank.
4) Monthly Cosmetic: Pay for a month of VIP, get the month's cosmetic item. Possible a chance to get a second one to acquire previous cosmetic items that might have been missed.
5) Cosmetic Bank/Wardrobe: Put hair dye and other cosmetics into a cosmetic bank for your character. If something like the Wardrobe this functions similar to the Stable for clothing/thematic items.
Possible ideas on the cosmetics, is special Thematic cosmetics. Like the ability to make it so magic missile shoots little skulls or birds, or even something that looks like playing cards. Change the appearance of your dog, wolf, bird, robot dog, skeleton warrior