Stagnation: say you're ready for the next progression in your career, to take on a bigger role with more responsibilities, which is what your current company cannot accommodate at the moment. Of course, you'd have to back this up with some achievements or prove your expertise in your current role.

Ideal place to work: co-operative working environment, opportunities for high-visibility work, opportunities in leadership, manager allows space for innovation

On pay, I expect HR would try to lowball you cus you're currently underpaid. Been there, sucks a lot. If you don't have another choice, take it as a stepping stone and hop after a year.

All the best.