The problem explored in this study was principals' low self-efficacy, which negatively affected school outcomes and could lead principals to set weaker goals and be less resilient. The purpose of this qualitative multiple-case study was to identify strategies that principals believed would foster better self-efficacy. The theoretical framework that guided this study was Bandura's theory of self-efficacy. The design aligned with the two research questions, about what influenced their principal self-efficacy and what strategies could be used to foster better self-efficacy for principals. Data were collected through semi-structured interviews and two focus groups with 14 Pre-Kindergarten to high school principals currently employed within the State of Maine. Themes and commonalities emerged when the data were transcribed, coded, and analyzed. Participants identified seven influences that positively or negatively affected their principals' self-efficacy: relationship with the superintendent, the influence of stakeholders, the importance of networking, the use of feedback and goal setting, individual experiences, the impact of COVID-19, and administrative burnout. Participants also identified strategies to foster self-efficacy which were professional development and networking, self-care, building trust and relationships, and finding joy in the job. Recommendations for future research include examining which professional development opportunities have the greatest impact on principal self-efficacy, the effect that superintendent behaviors have on principal self-efficacy, the impact that COVID-19 had on principal self-efficacy, and the effectiveness of employing the strategies suggested within the findings of this study. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]