In a negotiation, the person willing to walk away from the table always has the upper hand.
Of course, you wouldn’t be negotiating if you didn’t want to be there but you have to be willing to walk away if what is being offered doesn’t match what you went in willing to take and have set as your floor.
When you’re offered below what you can take, you should always be willing to walk away.
The other side mostly likely knows that what they are offering is not up to par and undervaluing you.
Stand your ground and be firm, always!