Make choices that come consciously from positions that are not egoic. Again and again. Retraining neural pathways can be done, but it does take time. Consciously making choices from a place of non-ego (though not necessarily self-sacrifice) almost inevitably strengthens ethical resolve.
Please let me know if the reference/site below is helpful to you on your quest:
Ethical Leadership and Developing a Code of Conduct for ... - IFAC
https://www.ifac.org/global-knowledge-gateway/ethics/discussion/ethical-leadership-and-developing-code-conductNov 5, 2013 ... Strengthening Organizations, Advancing Economies ... Effective approaches to instilling ethics and integrity, and using codes of conduct, ... Act with integrity in the marketplace;; Ensure ethics in PepsiCo's business activities; ...
Identifying and choosing value becomes less probable in dysfunctional social realities. Any coherent ethic comes from a coherent culture. In the absence of such, ethics becomes more problematic. Those aspects of life where value and actual benefit can be identified are relatively straightforward, i.e. basic needs, and necessary social relationships. Anything beyond that requires a pragmatic assessment of one's own understanding, resources, and capabilities and the same for those persons that we interact with. Ethics is primarily about intersubjective relations that build and maintain values, which requires a culture that share the basic perspectives. Shared understandings and meaning make ethics more probable; disparate perspectives make ethics more difficult.