Do Buddhist characters written in calligraphy need to be enshrined?

This is not necessarily! If you write a lot, there is definitely not enough room, or you can choose a painting that you think is unique, save it and frame it beautifully for worship, and leave the rest to the temple for treatment, or you can wrap it with cloth and stones or other heavy objects and throw it into the river and sea sincerely. You can't let it float on the water, or you can burn it to ashes with clean utensils. The ashes can't fall anywhere else. Collect them all, put them in cartons, wrap them with clean heavy objects and sink into the river and sea, so that you can become attached to the aquarium. Because both the cloth belt and the paper box can rot quickly, and the ordinary convenient bag is difficult to decompose, so the cloth belt and the paper box are chosen. We must be sincere and respectful. Copied Buddhist scriptures, spells and painted Buddha statues are all treated like this! There is no amitabha in the south!