Song of the Ages
As is usual in my campaigns, I strongly encourage you to write journal entries for each session from the perspective of your characters. (Do that here on OP using the Adventure Log section)
When you write a journal entry you will be rewarded with a point of Inspiration. Rules for using Inspiration is found on page 125 in the Player’s Handbook. You can only have one point of Inspiration stored at a time, and as it states in the book, I will be rewarding Inspiration during play sessions for good RPing. However, an easy way to guarantee a point of Inspiration each session is to write an entry.