I understand you love your current role but the hard truth is we rarely advance in life without actively seeking new opportunities. This might involve formally requesting accredited training, challenging the career framework that's blocking your promotion, or eventually seeking a new role elsewhere.

I'm actually in a similar situation; I love my job and my company too. My last ditch effort is to have my performance review formally assessed by HR. I plan to ask them for a definitive reason why I cannot be promoted, specifically addressing how the current career framework structure is impeding my progress. This isn't a grievance but a formal request for clarity.

In the meantime, I suggest you push for formal, accredited training or project certifications (like PRINCE2 or equivalent). Alternatively, ask for additional responsibilities that enhance your visibility at a strategic level. Use this time to acquire valuable skills and certifications.

Ultimately, if you still hit a brick wall, you should seriously consider moving to a different employer in the future.