There should be more Titles earned by getting lore, or Chronicler should be upgradeable.
As of right now, The Lore you need to collect to earn the Chronicler Title is just from Forsaken, and there’s been plenty more Lore entries from the Annual Pass and now ShadowKeep.
Here’s my idea: Make the Title in Tiers, the more Lore triumphs you complete, the higher the tier. Each tier would unlock a new variant of the Title, such as “Archivist”, or “Scholar”. There could even be titles relevant to certain lore, such as “Scribe”, for Season of Opulence, or “Journalist,” referring to the Black Armory Papers.
I like the idea, and I had recently started working on Chronicler myself, but realized unless I find a team of people to help me get the egg in Last Wish after the boss, I can't complete it anyway. So, I'm going to work myself up to that point, and maybe one day, but I'm not going to hold my breath.