When shooting directly into the sun there is always flair and, as others have said, no filter will help that. One approach is to move your shooting location around and determine where there is less flair. Another approach is to hold a hat over the end of the lens area directly in front of the flair, as identified by looking into the camera, and then, using a remote, take the shot, but be sure the hat is out of the lens range by holding it well above the lens (sometimes this can work without having to use a remote). Another approach is to, after ensuring you are getting the least possible flair, remove the flair in Photoshop or Affinity or Luminar using remove or clone tools.