I’m definitely no wiz yet lol. My strategy for getting the sound I want (aside from trial and error) is to compare the measurements between two headphones like I did with the very first post. When I think “warm” I think HD6XX, so I’d use that as my reference point. Otherwise I’d say warm sounding headphones will have greater bass emphasis centered around 100-200 hz. So you could start boosting there. But it might make more sense to lower the mids or highs instead depending on the headphone.
Also here’s a post with general resources related to EQ. Look at the video playlist and the DIY AUDIO link.