I'm not at Google, but I'd like to see their support system for post-recruitment and post-hiring. I currently have one neurodiverse (more than one condition) e

I'm not at Google, but I'd like to see their support system for post-recruitment and post-hiring. I currently have one neurodiverse (more than one condition) employee who has remained at the same career level for nearly a decade because they don't meet the criteria for the next level. They have expressed interest in advancing though. I don't know how to handle it. I can't promote them, as the next level role has much more responsibility and accountability, and they just aren't there yet. I just give them nice bonuses and salary bumps, but eventually it'll hit a limit for their job level and a higher-up will need to be involved. I've reached out to internal resources I was pointed to, but it's all very informal and difficult to find someone qualified to answer fairly specific questions. I've pointed the employee to resources as well, but one of their conditions kind of hampers their ability following through on vague directions. I feel frustrated because they're a good employee, but I've yet to find useful guidance on helping them get to where they want to be.