There is a lot of literature about the application of the self-determination theory in primary education.

https://selfdeterminationtheory.org/

In improving student motivation, the first thing that needs to be considered is the quality of the teacher where the teacher is the pioneer in the process of teaching and learning activities. Therefore, as a teacher must self-consciously continue to improve their quality, the second teacher must be able to maximise the available learning facilities, the third chooses the right learning method, the fourth makes interesting and creative learning media that can attract students to learn, and the last one evaluates every learning activity that needs to be done.