After China’s attack on India in 1962, followed by the Pakistan attacked in 1965, the idea of peace was vanished in South Asia. India did not initiate these conflicts, but the region has remained caught in a cycle of disputes, mistrust, and military tensions.
Anyway, political claims, domestic politics, and vote-bank considerations continue to be major reasons why these issues remain unresolved today.
The simple and practical solution is to accept the existing boundaries as international borders by all three parties and abandon unrealistic territorial claims. No country in the region has the power or the willingness to achieve its maximal territorial ambitions without risking enormous destruction, especially if a full-scale war were to break out and any initiative war for getting claim parts will auto get converted to full war, just for reminder - capitals of all three nations, within the nuke rangeS
However, after decades of selling unrealistic hopes to their own populations, combined with concerns about international image, strategic interests, and domestic politics, the china, Pakistan and India involved are likely to continue keeping the region unstable—even though they understand that realistically, none of them is going to gain the territory.