ASSISTANCE!!! Damage control – parking vehicle

Hello dear ones, I hope for advice and action here, because I am very confused. The following accident happened in mid-Dec. My vehicle Kia Pikanto ca 12.00€ BJ 2019 parked on a normal road which is however a bit narrow in turn. At this place where my vehicle was parked, another vehicle turned us to my wheelwheel so that paint scrapers and a dulle arose. This process could be watched by a witness who called the police. The police put a card on my disc because (I was at home and didn’t notice the accident) I made a complaint about a hit-and-run witness and I made a statement that the perpetrator refused any statement. An expert report (460€) on the damage (2,650€) sent to the police and a lawyer and in March 2021 I received a letter from the prosecutor that the proceedings were terminated in accordance with § 170 ABS. 2StPO. Additional the lawyer was not able to contact the opposing insurance yet or has not yet registered the opposing insurance. Although I received a letter from the insurance company that my data was taken up, but no more. Now to the actual question: Who will now take over the damage regulation and the costs for the expert report when the proceedings against the polluter were closed. There is even a witness to whom I am infinitely grateful that he has reacted so, but I guess that doesn’t have any value in the present day if the causer or the insurance doesn’t have to cover any costs. Maybe someone can help me which way I can go now or maybe someone has a few tips for me. I would be very grateful to get help here. I’ve never had a damage to my cars and now such a complicated case. I’m absolutely over-fed with the situation. In the appendix I add the letter of the prosecutor’s office. real protection at the Ergo I have, but have not yet made use of, if that helps. I thank everyone who takes the time to help me and wish you a nice evening.