I remember when I was a student, after I soloed my instructor signed me off to fly to neighboring airports, less than 25nm away. At first I was afraid of not being able to find my way back. But when I finally did fly to the nearest airport and land, I felt a feeling of accomplishment and it boosted my confidence.
I think in your case, you obviously had confidence at one time, which helped you pass your checkride. But since then your confidence has faded away. You just need to rebuild your confidence. Why not choose 1 nearby airport and fly there with someone - another pilot or an instructor or a non-pilot passenger. Fly there, land, taxi, and depart. Return to your home airport and shut down. Let the other person get out. Then you immediately make the same flight but by yourself while the terrain and all other features of the flight are still fresh in your mind. The plane will not know you are by yourself. When you return to your home base, reward yourself by just doing a touch and go or a stop and go, depart again and just fly about 5 miles away from the airport in a different direction than before. (You'll still be able to see the airport.) Then return and land.
Another thing that will help with confidence is taking some kind of course (usually just a couple of hours) in spin recovery or Upset Recovery. This is usually done in an aerobatic plane with an aerobatic instructor. After having taken one of these courses, where the instructor puts the plane in some extreme unusual attitudes, flying straight and level by yourself will seem like nothing. You'll feel more confident and have greater control over the aircraft.
Here's another thing that might help. I myself fly solo most of the time and it's hard to get motivated unless I have a "purpose" for the flight. Do some research and find out which airports in your area have restaurants or air museums or other things you can visit. Then plan to fly to one for breakfast or lunch, or to see the museum or whatever. Check and see when other airports might be having a "fly in" event. Here in Florida many small airports have a pancake breakfast on Saturday, as a fundraiser. Pilots fly there, give a donation, eat, meet other pilots to chat with, then depart.
Also, maybe you can join an organization that involves flying. Here in the US we have the Civil Air Patrol, and the Young Eagles which provides flights for children. We have organizations where pilots volunteer to take people to get medical care such as cancer treatments, and organizations where pilots volunteer to transport dogs and cats from an area damaged by natural disasters to an area where families can take them as pets.