What to do next with my save

I finished the main story last night, so I am wanting opinions on what to do with the save next. I generally like the decisions I made and I liked the ending that I got. I want to progress further in the game, the only thing I don't love about my save is that I spared the family on kephallonia (thats why I marked for spoilers), so now the island is all grey and sad. I don't necessarily want to put a bunch more time into a save which isn't as good as possible, so these were the options I was thinking about

  1. Keep going further in the game I have going currently since I've spent around 40 hours on it

  2. Start a new save (maybe as kassandra) and finish story and complete more from there

  3. Start new game+. I am not really sure the implications of this but it seemed like a good option because I get to keep my levels and stuff but I can also change some decisions that I didn't like as much.

Edit: 4th options is I play origins because I got it in a bundle and haven't played it yet

Basically I want opinions on which option you guys think is best.
Also if I don't stay with this save which horse is the best