1 Fence your property so that he is no longer allowed on it. 2 If that is too expensive, politely but firmly forbid him from entering your property; otherwise, you will report him.
If it’s too expensive, just get post sleeves and take the simplest hunting fence. By the way, any enclosure that makes it clear that not everyone is allowed on the property counts as a fence. It can also be patchy or a 30cm boxwood hedge.