Think you have it all pretty well covered but sounds exhausting.
Worth considering the Hop on Hop Off Bus Tours to get you around to some of these places.
Make sure you book ahead, online for Sagrada Familiar, normally long queues, allow plenty of time, it's magical.
If football fans, what about Camp Nou Tour.
Whetever you are, especially busy tourist places, beware of pickpockets.
Hope travel and tourist sites are all open again by the time you go, stay safe.