Pretty simple. The game is called Minecraft and we don't get xp for either Mining or crafting.
I know there was a mod that kinda did that in the past (l"evel up!") if I remember correctly; altough it also added other skill tree features and has been severely outdated by now.
I would simply want a mod or datapack that rewards you with a (very tiny, obviously) amount of xp if you mine blocks (and if it would be possible for crafting that would be great as well).
Now, of course, you shouldn't get 100 elvels by digging out a 10x10x10 hole, but a tiny amount every couple of blocks would add up nicely if you are digging a huge perimeter - and would make it feel a little bit more rewarding digging stone away for 9 hours straight.
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Carpenter, Machinist, Gamer, Nerd. Need I say more?