It is very tough to progress on squats AND deadlifts unless you are a true beginner.
I'll be talking about this from a strength point of view, which is mostly aimed at improving your deadlift poundage. Generally you should prioritise your squats over deadlifts. There are many ways your deadlift can increase - I myself did not deadlifted for more than 5 months. But when I finally did them, I broke my old records easily. Why?
Because when I wasn't doing deadlifts, I was doing:
1) Lots of pullups
2) Lots of split squats
3) Hamstring work (SLDL and some leg curls)
4) Heavy dumbbell rows
5) Of course, some squats
True, the deadlift is a lower body exercise, but you need to have a strong back as well, and of course a strong grip.
As for the squat, to improve your squat, well you need to squat.
If your aim is to gain muscle then, I guess you could get away with going light on deadlifts - I know many 'pros' who do deadlifts the last on their back days, so that the focus is on the muscle, not on the movement. Maybe that can work for you.
Also, never say 'I did not feel energetic enough therefore I did not attempt it'. At the very least, go through your normal warm up. Like myself, for deadlifts I'll warm up with 40kg, 50kg, 60kg, 80kg before moving on to my work sets. No matter how high my work set is, I will always do 40/50/60/80 to get a feel of the movement. If I feel that the weight seems unusually heavy today, then I proceed with caution. Don't just skip a lift altogether, you'll be surprised with what you can achieve sometimes.
thanks for the advice des! maybe I shouldn't have skipped it too.. I usually do it on my back day, but if I do, come my legs day itll b burning like mad and I cant do leg curls properly. Still contemplating how to adjust my split.. currently its back/tri, shoulder/legs n chest/bi.. hmmm.