To use job offer as a bargaining chip with current employer?

[Fressia123]

Work has been very slow in changing my roles. The current one is making me feel like my brain is slowly dying. The job I've been offered is not much more in money terms but I think I'll learn more and potentially might have more transferable skills than the one I'm supposed to eventually transition at work. My DP thinks it's a terrible tactic but I'm getting tired of the "we're working on it" from my boss.

I wouldn't be bluffing, I'd rather stay but it seems like nothing is making them move at a quicker pace. Seeing other internal roles and not being able to apply was a blow. Last thing, I emailed my boss that since he commented I needed some sort of training and they're onboarding new people, that maybe I could be trained with them. He then just promised me he was working behind the scenes but nothing concrete.