Hey OP, I think you've had a tough time of it, and even without that, I am estimating your children are no older than 5 and 3, and honestly yes, it can be a bit of a slog when they're young, and you had them during a very difficult time with the pandemic etc. Couple that with feeling a bit meh about work, and then the shocking and dreadful situation unfolding with your wider family, I can completely see why you feel the way you do.
I go through phases of feeling like that, and I think it's when none of my 'life domains' are really working out the way I would wish them to. It doesn't feel like that when something is going well, e.g. if home is comfortable and nice and not too chaotic, that helps, if work is going well, then that helps, if I am enjoying being a parent then that helps, if I am having lovely quality time with my aging parents then that helps, if I have some fun social times then that helps. If I am in a phase where none of those is really true, then yes, it just feels crap. Life can be hard, and it can be hard work. Hard work is OK if you feel like there is some kind of positive result or outcome, but if you feel like it amounts to nothing positive at all, then yes it is a very bleak feeling.
Sorry this isn't helpful or constructive at all, only to say that I completely relate.
I suppose what I have learnt to do when I feel like that is pick one thing, even a small thing, but a wholesome kind of a thing, and tell myself it is worth doing, and it will improve something, like spending time at the weekend cooking something lovely and homely, or tidying a messy room, or taking my daughter on a walk. They're not exciting or life changing things, but often if I sort of force myself to be in that moment and appreciate it for what it is, then it helps me to feel better. And sometimes it's even things that a cynical me would think a bit 'lame' some of the time, like going to a small local event that I wasn't really that interested in....but you can sort of make yourself see good in those things if you try, and once I start to see the chink of positive light from these small simple things, it helps me to breathe and feel better about everything else.
Final note....when I had actual depression/anxiety post-natally, I would try my hardest to do simple things and even when everything appeared to be going swimmingly (sunny day, bike ride, picnic, etc.) I was still in tears of desperation and feeling black and unable to feel anything associated with happiness at all. That was different. If this is you, then it isn't just feeling bleak or lost, it's something more and you might need help to overcome it.