For long series where I want to mark what I've read, what's left, and keep updates I only use one message. Then I simply edit that message as I get back into the series.
Ark Royal (book 1) - Done
The Nelson Touch (Ark Royal Book 2) - Done
The Trafalgar Gambit (Ark Royal Book 3) - Done
Warspite (Ark Royal Book 4) - Done
A Savage War Of Peace (Ark Royal Book 5) - Done
A Small Colonial War (Ark Royal Book 6) - Done
Vanguard (Ark Royal Book 7) - Done
Fear God And Dread Naught (Ark Royal Book 8) - Reading now...We Lead (Ark Royal Book 9)
The Longest Day (Ark Royal Book 10)
The Cruel Stars (Ark Royal Book 11)
Invincible (Ark Royal Book 12)
Para Bellum (Ark Royal Book 13)
The Right of the Line (Ark Royal Book 14)
https://www.amazon.com/gp/product/B0749RCMS5