You can control how you develop yourself. What you can’t control are the market forces.
Develop your T-shape in accordance to what the market demands. Let market trends fuel and fund your T-shape development.
I have a background in startups and design-thinking – that makes my breadth. Right now, I’m developing the vertical part of my T in UX.
If market tells me ‘Agile’ is in demand and there is enough supply of visual designers who dabble in UI, I’ll position myself as a UX researcher for Agile teams.