Waitlist during the intervention period, and receive Big Five on week 5.

The intervention is self-guided and consists of a brief 14-page psychoeducation module that they are introduced to in the beginning of a 4-week intervention period (day 0). The module starts with a general introduction to mental health and Things you do action and how it promotes mental health. The final section presents the five core actions: 1) healthy thinking, 2) meaningful activities, 3) goals and plans, 4) healthy habits, and 5) social connections. Participants are advised to engage in the five daily actions throughout the intervention period. They are also encouraged to fill out a weekly planner and monitor their progress by keeping an overview of the number of daily activities in "My Week".The participants receive the module on a Sunday (Day 0). They receive text reminders Monday to Friday for four weeks, encouraging them to engage in the actions.

the scale measures measure anxiety symptoms over the last two weeks. The questionnaire consists of seven items on a 4-point Likert Scale ranging from 0 (Not at all) to 3 (Nearly every day), giving a minimum score of 0 and maximum 21. Higher scores indicate more anxiety symptoms.

The scale measures depressive symptoms symptoms over the last two weeks. The questionnaire consists of two items on a 4-point Likert Scale ranging from 0 (Not at all) to 3 (Nearly every day), giving a minimum score of 0 and maxiumum 6. Higher scores indicate more depressive symptoms.

The scale measures depressive symptoms symptoms over the last two weeks. The questionnaire consists of nineitems on a 4-point Likert Scale ranging from 0 (Not at all) to 3 (Nearly every day), giving a minimum score of 0 and maximum 27. Higher scores indicate more depressive symptoms.

The scale measures anxiety symptoms symptoms over the last two weeks. The questionnaire consists of two items on a 4-point Likert Scale ranging from 0 (Not at all) to 3 (Nearly every day), giving a minimum score of 0 and maxiumum 6. Higher scores indicate more anxiety symptoms.

The scale measure subjective well-being and life satisfaction. The questionnaire consists of five items on a 7-point Likert scale ranging from 1 (Strongly disagree) to 7 (Strongly agree), giving a minimum sum score of 5 and maximum 35. Higher scores indicate greater life satisfaction.

The scale measure their experience of gratitude. The questionnaire consists of 6 items on a 7-point Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree), with two of the questions being reversed scored, giving a minimum sum score of 6 and a maximum score of 42. Higher scores indicate greater experience of gratitude.