I don't think you come to terms with it. I think you get better at not *thinking* about it constantly, which is different.
The honest version: I've made peace when I remember that dying isn't something I have to solve or optimize or prepare for perfectly. It just happens. That's less terrifying once you accept you have no control over the timing or conditions.
What actually helps more than philosophy is living in a way that makes you okay with the life you actually had, not the life you think you were supposed to have. Because the real anxiety isn't death - it's unfinished business. Regret disguises itself as fear of mortality.
So maybe the answer is less about coming to terms with death and more about coming to terms with having already chosen what you chose, made the mistakes you made, spent time on what actually mattered to you. Die thinking "that was a real life," not "I wish I'd..."
That's the only version of acceptance I've found that actually sticks.