Tips for 'intermediate players?'

Can you guys suggest any good videos for me to watch to improve, which worked for you?

I have a total of 80 hours on AOE HD/DE now. So even though I suck, I wouldn't call myself a 'beginner'.

I feel like I'm competent now in basic areas like: Constant villagers, unit counters, fast feudal...

A lot of the videos I'm finding are already covering this kind of stuff which I already know. Things like efficient walling, which upgrades to prioritise and scouting efficiently would all be cool to learn more about.

Thanks!