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If there is prior art for your idea but no commercial product, and you are convinced that a product could be successful, a possible strategy is to stop trying to be an inventor and consider becoming an entrepreneur.
Try contacting the owner of the IP in the idea. If the owner is not ‘working' the IP, it may be worth discussing a deal in which you take a licence to exploit the idea.
Or there may be an existing product but it is not being sold in your country. You could consider becoming an importer, or a manufacturer under licence.
Or you might discuss with the IP owner the possibility of your redesigning or modifying the invention for a different application or a different market.
If you are entrepreneurially minded, something may be possible!