I. Alter/change the way stamina is used in game to make it more balanced with magicka use
A. Consider changing class skill trees to reflect a choice in magicka, health, or stamina
1. i.e. Nightblade assassination uses magicka, stealth uses stamina, siphoning uses health
a. For health make a separate bar under health to reflect heart power that would be used to power siphoning skills (this would be the model for other skill line trees as well) so in effect allocating points in health will help with overall survivability but also be used for certain skill lines.
II. Improve the usefulness of interactive items
A. It was a great move to make items interactive in the world, but they almost seem pointless and have no real use other than cosmetic.
1. Consider mixing in very rare items in delves and dungeons and other locations that change place randomly and have good value and utility. Or perhaps there could be items that could be constructed by gathering all the parts with requirements like "can only be assembled by a blacksmith with skill greater than 40" and vice versa for clothing, enchanting etc.
2. Perhaps have very rare items that can be found in containers and shield racks and weapons lying around that could go towards achievements or be collectibles for player housing (when it happens) or have some sort of intrinsic value where people will want to trade or sell them
III. Improve conversations between players and NPCs
A. Consider having open ended conversation threads that can be followed in every major city and town with a speechcraft skill line that would grant you benefits like reduced prices at vendors or allow you to sell those 0 gold items for more gold

IV. More roleplaying and sandbox elements
A. Fore example lively inns and safe haven in Cyrodil to meet with players of other factions and challenge them to brawls drinking contests etc.
B. A bard class or guild with a skill line that would give tactical benefits and for entertainment value and to utilize those music vendor stations dotted all across tamriel