Supply and demand. Increase demand and the need for supply increases.
For that to happen, wild venison needs to stop being marketed and sold as a premium product at a premium price, to be eaten on ‘special occasions’.
Your average family aren’t eating meat at £20+/kg regularly, especially when they don’t know what to do with it, will probably overcook it so it tastes awful. They might try it once, but will carry on walking to the £4 whole chicken aisle next time.
Dealers should get it made into highly accessible products like burgers and sausages, price them in line with pork/beef equivalents and watch them fly. Whenever I’ve fed venison burgers/sausages to friends most have loved them and, those who dont know, ask where I get them from. They are often disappointed with the answer as they don’t have the knowledge, time, access or interest in stalking. Then further disappointed that I and people like me cannot ‘sell’ them to them. I cannot justify the cost or time to jump through the ridiculous numbers of hoops to become a food business (that’s a whole other issue!).
If it doesn’t make business sense for dealers to process and sell burgers and sausages at volume, then they should be centrally subsidised if they are serious about controlling deer numbers. We’ve been doing it with farmers for long enough!