This is going to sound strange, but from personal experience, it sounds like you need to move on.
It almost doesn't even matter what you move on to. It doesn't even matter if it's with the hottest tools, or if it's with the worst tools in the stack. What matters is that you've stopped learning. And almost by definition, anywhere you move to from here, will be different from here - and thus, will give you a chance to learn.
Don't wait until you've found a "perfect mentor" to move. Don't do what I did, and kill your time and energy waiting for the perfect opportunity to move, learning nothing when you could have been learning something. Each thing you move to will give you a little more opportunity, a slightly different perspective. Sometimes you'll even take steps backwards by mistake - but that's OK. Turns out that you're learning from those too. What's important is that you keep moving.
It almost doesn't even matter what you move on to. It doesn't even matter if it's with the hottest tools, or if it's with the worst tools in the stack. What matters is that you've stopped learning. And almost by definition, anywhere you move to from here, will be different from here - and thus, will give you a chance to learn.
Don't wait until you've found a "perfect mentor" to move. Don't do what I did, and kill your time and energy waiting for the perfect opportunity to move, learning nothing when you could have been learning something. Each thing you move to will give you a little more opportunity, a slightly different perspective. Sometimes you'll even take steps backwards by mistake - but that's OK. Turns out that you're learning from those too. What's important is that you keep moving.