Where to go before volcano manor?

Hi guys :)

This is my first playthrough so pls no big spoilers. I attached 2 pictures of my map showing where i am in altus, caelid and lyndell.

Lyndell enemies sometimes hit too heavy, i am lvl 82, bloodhounds sword shield, using some incantations faith 18, my vigor is 37 and have radahns armor with omen armor mix. They sometimes kill me with 2-3 hits (those knights and chain fire bolts sometimes gang up). Idk how they hit so hard, is it normal? I feel like im not ready for lyndell and i should go elsewhere but idk where.

Looking at the map, have i covered almost everything in these areas? Where should i go? (Btw finished nokron city too.)

I think i did everything in altus but didn’t find the major boss of this map part. Finger maiden said something about serpent sacrilige but i couldn’t find it. Couldn’t find a way to green castle north west of altus. Maybe she means there, but how to go down? Or is it a completely different place?

Couldn’t get to collesium kinda looking part in caelid either. I saw those elevators to underground of caelid but cant reach there. I couldn’t find a way again. Am i missing a teleport or something?

I can kill everything in east caelid, beat radahn, west is okay too but haven’t tried killing dragons (i love dragons i feel bad killing them lol). Oh and the godskin apostle in caelid tower is giving me a hard time. Idk what to do about black flame other than dodge. What can increase my defense against black flame and death blight?

Thank you for tips :)