After the last of the Mages Guild quest, I was awarded a magic chest which duplicates ingredients. I didn’t bother trying it, though, instead returning to my house in Bravil to dump a load of stuff, and then being told my Dragon Armour was ready to pick up from the Imperial City armoury. So, I went off there to get it.
Most of the armour is an improvement over my current stuff, so swapped a few items over. I still kept my boot o’aceness though.
I then started following the Dark Brotherhood questline. Went to Cheydenhal to be initiated into the group, talked to the followers of the Night Mother in the sanctuary there, and bought a Bow of Flame (which is a bit better than my now aging Bow of Embers). Was given a “contract” – to kill a pirate on the ship at the Imperial City waterfront. So I did, and it was easy. Returned to Cheydenhal for my next quest, although I haven’t started it yet.