Mia Walmsley, of Footprint Travel, and Kate Holroyd, of Strawberry Holidays, released the first edition of "Beyond the Bookings: Marketing Success Planner" in 2021.
The duo described the guide as a "roaring success", which reportedly sold out twice to more than 500 agents.
The planner aims to help independent travel agents and consultants focus on and improve their marketing output.
Walmsley said more than 90% of previous buyers said they would buy the guide again if it was focussed on 2022.