The Divine Orchestration Of Celestials

A middle aged man after dying with regrets in a war gets sent back to his early teens, where he trys to correct everything he did wrong in his past life and making use of his knowledge from his past life. Using everything it took to Try and save everyone he held dear who had died in his past life. Wanting to become the person he never became, a wielder of time. All that, in order to get the ending he always had wanted but 'never' got.