My idea is to follow some sort of design process. I haven’t figured out which one just yet, but most of them are quite of similar: You gather information/understand the user, then you define the problem/need, then you develop som sort of concept that you rapidly prototype and test. Then you iterate this all the way to the final product! 

The process

1: In-Depth Interviews, and/or Ethnographic Field Studies, and Evaluation: https://www.nngroup.com/consulting-field-studies/
http://www.designkit.org/methods/2

This is the investigative part in the lower left quadrant. It is qualitative and focuses on attitudes. From this part I just want to get a base and gather as much information as I can. I will either do 2-3 in-depth interviews, and/or ethnographic field studies where I observe the users in their natural habitat.

2: Send out survey to gather more information: https://www.nngroup.com/articles/quantitative-user-research-methods/

Still focusing on attitudes here, but gathering more quantitative data that support my coming design choices, lower right quadrant. This survey will be based on the answers from the interviews/field study, and on current research about the topic.

Frame the Design Challenge: http://www.designkit.org/methods/60

From all the problems and needs I gathered I will be able to definitely define my design challenge. This is needed in order to have a clear goal with the design.

Compose Success Metric Signals: https://designsprintkit.withgoogle.com/methodology/phase2-define/success-metrics-signals

By coming up with what the goal is, how success is seen, and how to measure it, I will be able to choose my final test method.

User Journey Map or Storyboard:
https://www.nngroup.com/articles/storyboards-visualize-ideas/
https://designsprintkit.withgoogle.com/methodology/phase5-prototype/storyboard
http://www.designkit.org/methods/63 

I will create a journey map (more general) or a Storyboard (more specific) depending on how detailed I feel that I need to be. This will lay as a base for the prototype.

*** Start of an iteration loop ***

Decide What to Prototype: http://www.designkit.org/methods/34

Rapid Prototype: http://www.designkit.org/methods/26

3: Test Prototype: (Test depends on prototype)

Upper left quadrant: Behavioral and qualitative

Evaluate and Find Themes: http://www.designkit.org/methods/5

Integrate Feedback and Iterate: http://www.designkit.org/methods/4

*** Go back to iteration start***

4. Develop Final Prototype and Test: (Test depends on what metric to measure)

Upper right quadrant: Behavioral and quantitative

***

This is the rough sketch of my design process. The latter parts of it will be better defined as I go through the process.