You see, it's a very basic concept, there is strength in numbers, one of the biggest racial advantages of vampires is being able to expand their numbers quickly by creating family members, even more so in a world like this where family members are forced to obey, therefore, any vampire and more loyal and has a higher starting point than any other pro MC subordinate, in addition, it does not prevent him from having more than one bride.

the fog cannot pay, their numbers are already small, you should retreat and let their numbers decrease as much as possible, before attacking.

The simplest way to resolve this is to simply retreat and let the mist resolve the tailed beasts and consume their power and attack later.

in fact, this is a great opportunity for them, the mist village cannot control the tailed beasts, releasing them is simply stupid, out of spite, the tailed beasts are much more likely to attack the mist ninjas than the Uzumaki clan , let's say that even so the author forces a situation in which this harms the Uzumaki clan, the clan specializing in sealing could deal with it, besides the jutso of sealing the ghoul is almost insoluble, you should take advantage and seal the mizukage and demoralize the entire army.

why...

I don't understand why he didn't transform her... she would clearly be loyal to him, as well as an added strength and a woman by his side.

In a fantastic universe like this, perhaps the MC should look for a way to free himself from dependence on human blood, such as forging an artifact, ritual or spell that could turn water into blood or multiply blood, if he succeeded he could greatly expand the population of vampires under your control.

I'm a little disappointed, I expected it to be a story about building a great vampire empire, but it looks like it's going to be another story with the vampire protagonist playing at being human.

I hope he's referring to vampires... because cultivating a powerful human army is asking to be stabbed.