[Help Removing Lens Flare - Tutorial Video didnt help]

Wow thank you guys for the help it's much appreciated!!

[Help Removing Lens Flare - Tutorial Video didnt help]

Hi I am new to the forums as well as Affinity Photo although I do have a little bit of Adobe PS experience. I need help removing lens flare/colored streaks from a photo and I am not sure how to go about it. I tried using frequency separation with the clone and healing tools as discribed in the Vimeo tutorial although it doesn't seem to help much. It doesn't seem to have much an effect and it is very difficult to replicate the texture. Attached below is the picture. Any help would be greatly appreciated. Thanks