Nikwax Fabric & Leather Footwear Cleaning and Waterproofing Duo-Pack, 125ml, Spray On, Restores DWR Water Repellency, Shoe Care, Boot & Footwear Cleaner, Rain Protection, Safe for Gore-Tex

Do your research because I don't have Gore-Tex shoes but I have dealt with waterproof breathable clothing. Basically you give it a good wash with the specific washing chemical, and then you apply the waterproofer. For clothing sometimes it needs to be heat treated to activate the waterproofing again, depends on the brand So maybe stick them in the sun or in the dryer at a specific temperature, I'm not sure for your shoes. Good luck my friend. I had similar boots from that company for many years before I swapped over to Trail runners https://a.co/d/0dvmAi2m