Getting into IT management

With a 15 years of combined experience in working at ITSD and as a BA. How can I prepare myself for an IT manager or SD manager role. I feel my examples are at a ground level which is why I feel have not been able to secure a manager role. Could someone please guide me about some good quality example to discuss during interview. I guess majority of hiring managers are looking a good mix of Infra, ITSM, ITIL and cyber. Some eg that I have been discussing; ITIL: having a good problem and change mgmt Cyber: having a good security in the form of MFA and data security. Having cloud based automations with encryption. Asset mgmt: remove complexity and having a good device mgmt like intunes. Infra: good transparency across all teams of L1, L2 and L3 for ticket efficiency Vendor and stakeholder mgmt: around projects that has a purpose and elevate IT products and services. Service delivery: contract negotiation and finding a cheaper alternative.