Hello, comsalud. We feel very sorry for your not satisfying experience. However, in Uspacy you can create subtasks easily on any AppSumo Tier plan. Here you can find the article about how to work with subtasks in our product - https://ua.uspacy.support/en/articles/7238681-how-to-work-with-subtasks
As for customizing the board, it is a basic feature of Uspacy and is available on every single plan. Here you can find more information about it - https://ua.uspacy.support/en/articles/7216039-work-with-tasks-on-the-board
I hope you will find this answer useful and maybe will consider trying our product one more time. Thank you.