Wide range of different types of commercially Cajun, Greek and Japanese Seafood Seasonings. You can also find specialty seasoning on the Etsy Website for example Sweet Smokie Joe Fish Seasoning. Some of the plant based shrimp products, like Raised by Plants use a special ingredient from the root of the Konjac plantRaised by Plants
Japanese use several different seasonings in preparing their seafood.
Making your own seasoning requires some bulk seasonings like red pepper and a coffee grinder which you can find very economically seasonings on EBay to grind seeds and other ingredients into finer consistency.