What should I be doing?

Hey guys! I've been playing blue prince on and off for a couple of weeks now, and I've gotten about 50 hours on the game and I've been loving exploring and following up on all the leads I've gathered. The thing is: I'm sortof at a standstill. I've been trying to take note of all the things I find but they've managed to catch up to me and now I feel like I've chased down all the leads I have, and I'm getting a bit impatient.

I love figuring out things on my own but I'm at a point where I'd like to make some real progress and I just don't know what to do, so here's where I'm at in the game:

Things I find notable that I've done:

• !Reached room 46 (and entered it again to find the blue crown and the hints to the sanctum keys)!<

• !Found 5 sanctum keys (reservoir, music room, hideout, room 46 and throne room!<

• !Completed 2 sigil puzzles (orinda and fenn)!<

• !Opened all safes!<

• !Gotten the following notable found floorplans: Conservatory, Lost and found, Throne Room, Tresure Trove and Sealed exhibit!<

• !Read lady epsens diary and drafted antechamber in outer room to find the shrine guy with a message!<

• !Stolen the red paper crown (currently chilling in my coat check)!<

• !Gotten 7 trophies (full house, explorers, bullseye, logical, drafting, trophy 8, and inheritence)!<

Here's what I know I must do:

• !Power hammer in the room where you can choose a chess mantle and power hammer in weight room for another lever (haven't gotten to it yet)!<

• !Get one more achievement to be able to purchase blue tents!<

• !Find the other 3 sanctum keys, and figure out all the sigils!<

• !Find some sort of scepter and some sort of stone to be able to claim the throne!<

• !Figure out what to do with the letters saying "CAT" and "DOOR" in a specific order!<

So here's the case: I have some sort of leads to track down but they all seem to require a lot of effort and I'm not sure where to start. So I'm asking for some guidance on what I should be doing and maybe some hints for the trickier parts :)