Buff Vampire Knife.
The tap hits are currently providing very LESS life leech. Increasing its life leach may seem unbalanced for the vampire class, but due to the rapid loss of HP in sunlight, enhancing tap attacks is necessary.
The hold version requires more time to charge and has the same hitbox as the tap attack. It was ideal for raiding towns before, but now it is completely useless.
Improving the knife's effectiveness only for vampire class users will also help, but please don't make the vampire class useless. Its current disadvantages are already too much, so let's not worsen the situation.