The only advise I can give is try to roll a sorcerer, if you're going to attempt to run the Imperial City solo. And or any other group-based content solo. Why? Because sorcerers have access to pets (Daedric Summoning skill line), which can be beneficial to you for playing solo (e.g. Clannfear can tank somewhat as the Twilight can act as either a healer or added DPS). And then just farm as many champion points as possible. Besides that, I don't know what else to tell you. Good luck regardless.