Can't seem to be able to get new orders to start
I completed bloodlines and rejected horkon but new orders won't start at all. I tried everything. I tried restarting the story.
Solution 1:
When you rejected Harkon, he teleports you outside the castle gates. Your next move is to head back to Fort Dawnguard and speak to Isran. (Sometimes it won't let you fast travel back to the Fort. You will have to walk to Dayspring Canyon.)