All You Need Is Kill, Re:Zero kara Hajimeru Isekai Seikatsu: Dai-1 Shou - Outo no Ichinichi-hen Recommendations
In both of these series the protagonist resets time upon his death. It portrays the character as someone who is struggling and fighting alone, with no help from others. One way or the other this ability will be exploited so that the protagonists and those dear to them will be able to survive.
Time travel and has the chance to change history once the mc dies. they start all over at start point if they die and both mc tries to protect the girl they like.
The protagonist finds himself in a time loop, one that is triggered by his death. He needs to overcome his fear and use the available means in the loop to get stronger and figure out a way to survive the loop and break out.