This feels like an odd cope, sure I might not be able to do anything about my mortality, but I still view the fact that I and other people are mortal as a damn tragedy (and often the gradual decline and non-dignified end of people's lives). If someone held a gun at my head and I knew that within a minute they're going to pull the trigger, I'd be rightfully quite disturbed. Now knowing that a metaphorical trigger will be pulled at a random time decades later doesn't make it any less disturbing. The only solace there is ignorance.

> do it either via exceptional deeds or via well-raised children

Both of those are worthy pursuits, but are also categorically different from you being here. So sure, you can and probably should say that living a good life is what people should do instead of losing sleep over their mortality - but that also moves the goal posts in a sense. You could have cut it short at the equivalent of "you'll never be immortal".