Peugeot 107 – Mould in the trunk/water entrance – Repair or Sell

Hello together, my post is a little more extensive than a pure sales consultation. If the thread fits better elsewhere, please move it there. Thank you so much I found out this weekend after heavy rain that water has entered my Peugeot 107 in the trunk. Everything there is completely wet. Unfortunately I had a cover in the trunk and no longer looked under it. Now the disaster is perfect, it has properly mold in the trunk I had the topic of water entry already last year, at that time in the area of the windshield, since the glue did not hold there anymore. Now again water entry. Google thinks that the problem may occur more often and have different causes. Now I am thinking about what I do best. The car has about 120.0 m. I am not sure if I can get the right idea of the car. 00 kilometers on it and is about 10 years old. TÜV is on in September. Car is otherwise quite good in the shot. I’m basically happy now the question is whether I’m buying a new car. Have looked at mobile and there is a Peugeot with the mileage in my region with approx. 2000 – 3000 € listed. How much I can expect for mine then, I can hardly estimate. I am now thinking about whether I’m selling the car and getting a new car or again the Maybe remove mold and then sell clue enters the water? Here I need your assessment which makes the most sense. Thank you very much.