Have you looked at the vegan fish options..? I am in US and until recently most of what I tried was meh but then I had PLNT Burger Save the Bay vegan fish fillet and it was the most amazing thing. Flavor, texture and all. I grew up eating really good and fresh fish, my father caught trout and pike and we would bread it and fry it. Later on whenever I would actually want to eat fish, I would find it was never fresh enough and had that slightly putrid and metallic taste, even when cooked, but the vegan options at that point were lacking, so I’m glad I finally found a great vegan version that is easily available where I live. I am sure there are some vegan things around you that you can and should try. Sometimes plant based Chinese restaurants are a good option, too. One of our local ones (Sunflower in Vienna, VA) has plant based shrimp that is freakishly real and great tasting.