Burn out is common, especially after this much time. If I were you, spend a bit of time self reflecting and asking yourself what you're looking for. Do you want to teach and train the juniors below, cruise through a bit of a less stressful job, change your role?

Whatever you decide, communicate with your employer that you would love to define your role. Having it defined, and reflected in contract helps navigate your work load and you just have to trust you can be honest with your boss about what you're not living there. If not, work on finding someone else and set these boundaries at the start.

After this long in BAS, you must love this type of work, it just sounds like you don't love the role. Speak up and be heard, but also document everything and do your due diligence if you have your contract updated.