What advice would you give other CISOs for disclosing their own feelings of burnout to their manager, given that many fear they could be perceived as ineffective or face other negative repercussions as a result?
I agree with Matt. There's a risk that this kind of information could be weaponized and used against you. If you're showing signs of burnout, you need professional therapy. This is usually available through EAP programs. If you're concerned that your organization will judge you for needing more work-life balance, it might be time to consider a transition. For me, gardening helps to keep me balanced. If you can admit that you're struggling, then you're on the right path to getting it fixed.
I love what Ian wrote. There's a difference between being burnt out and needing some work-life balance. If you're worried about discussing your stress or workload with your management, or if you're dealing with personal issues like a new child or aging parents, and you're afraid to share that, you're probably not working for the right people.
You were burning it to even get here!
One of the key things to discuss is support, in the vein of humans. You can't be promoted to ciso and keep your old duties. Ciso role is very very different and requires a ton on reading, researching, engaging, physical visits (thus travel), as well as staying on top of all the situations you previously addressed before you were a ciso.
My advice, take your vacation days without a computer and be frank about work load with your c level peers, don't worry about what your boss thinks. You were promoted/hired to the role, be honest and perform with passion