There are several issues you need to address.
Your collar is not a true cutaway. It needs to have a larger spacing where it comes together.
Your tie will then fill up the open space, without the collar forcing it down, eliminating the arch you desire.
To create an arch, your FIH knot must be tied very tightly, with a correctly positioned dimple.
You have a loose knot, and it looks terrible.
I would suggest that you have a tab collar shirt made, with french cuffs.