We have spent a lot of time discussing specific parts of photography and different aspects of art and science; but now I would like to take some time and step back for a moment to say “Do not forget to have fun!” If photography has become “a job”, “a chore” or “the daily grind” then change things up. Find something you are passionate about. Research its details, study it and find a way to capture what you learn in photo.
For instance, I love history. So when I get stuck on the routine tasks I begun reading about a century of time past; researching the pieces of equipment used in that time, learning their manufacturing process and where I might find a replica or historic artifact of the time today. If all I can do is find it in a museum that will do, but it is even better if I can capture it in the surroundings of the period!
Have you ever considered going to Mid-evil or Renascence re-enactments? What about finding a re-enactment group in your area who practice sword fighting or falconry? They do things up to the “Nth degree” and more than likely would give you an intriguing perspective of this period from their own studies of history.
If you focus on portraiture, you will have plenty of opportunity to get portraits from that time period, or you may find a member of the re-enactment group willing to suit-up your family/children in period costume for portraits! How fun that would be! If you descend from European familial ties, you may be able to connections to your family crest, Scottish Clan or Irish Clan. That would be the ultimate vacation or photography experience to be able to record family ties at the same time as studying the surrounding events of their day!
Remember, Photography is a skilled Art and it ought to be fun, so work to keep it fun!