A camera belongs to the category of electronic waste and must not be thrown away in household waste. Because they contain recyclable materials that can be further processed. You can either dispose of your e-waste by post or find drop-off points via Google.
Many manufacturers and retailers take back their old products. The disposal is done in recycling plants. When the individual raw materials are separated and sorted, they are then used as secondary raw materials for the production of new cameras.
You can also offer your used camera for sale or for free on various platforms such as Ebay. There are enough collectors or hobbyists who are happy with older specimens.