I'm going to make a normative argument here, so please forgive me for preaching, but I think the problem is twofold. On the one hand, you should lean in to the

I'm going to make a normative argument here, so please forgive me for preaching, but I think the problem is twofold. On the one hand, you should lean in to the opportunity to teach more - it's a great chance to consolidate and find your own blind spots. You should schedule a large amount of fixed hours (say, 60% of your work day) to this if its a crucial part of your role. On the other hand, the company is underserving your juniors by having only one senior to confer with 15 juniors. The ratio should be closer to 1:5 in my experience. This also means you can spend more time with an individual junior to discuss technical points more deeply. In terms of what you can practically do? That's harder to say, but the other comments here seem helpful. My personal suggestion would be to consider employment elsewhere (while being cordial and pleasant with your existing company throughout and after the departure).