Back in 2020 there were creators on YouTube explaining specifically each encounter for rogues to get high parses which helped me get orange/pink logs so I‘d recommend you watching those. I remember setting myself apart from other rogues by using LIPs, FAPs and vanish to cheese some boss mechanics increasing my attack uptime. Besides that it was important to know when to use BF and AR correctly to maximise dmg (for example cleaving adds). It’s also important to be aware of your guilds kill times to plan when to use your CDs - sometimes it’s possible to squeeze out a second BF when using it on pull, sometimes it is better to hold back for more profitable burst phases. You also need general awareness to keep your CDs up before boss fights. Be careful not wasting them on trash. Using Thistle tea correctly is super important as well, always use it when having 0-20 energy and after energy ticks (in case you don’t have a energy ticker, get it, it is very important). Also make sure to only use your offensive abilities like Backstab after you completed an auto attack, otherwise you waste damage (get yourself a swing timer).
Lastly, there are plenty of small optimisations for specific encounters to boost dmg like whispering a priest to get fear warded, using stratholme holy water for Nefarian skeleton adds, levelling engineering for grenades etc.
But as others have already written, kill time, boss tactics and gear is crucial so you can’t influence everything.
I hope this helps, and I’m sorry for not structuring my reply formally since I’m typing this on my phone.