This issue here is that you need to find a buyer with a better deposit
This, I had a similar issues selling a house because it was a new build close to an area of much older cheaper houses so our 600K houses were compared to 250K houses and deemed over valued. yet, there were buyers willing to meet asking price. We accepted the highest offer but that fell through because they had a minimal deposit and the bank valued property lower. In the end had to accept a lower offer so someone with a much better deposit could get mortgage approved.