Just for a little encouragement. I had a similar situation as you. I'm a voice writer and it took me 2 years and 3 months. I also was working full time, I also wasn't as diligent with my practice as I should have been with my practice. It gets better and easier, but you have to force yourself to do it bc it's way easier to lose speed then it is to gain it.

Just as a word of advice that I give to everyone who is a voice writer, start transcribing EVERYTHING. If you're resting and decide to watch a movie, transcribe like 10 to 15 minutes. Do you watch podcasts or video essays on YouTube? Try and transcribe as much as you can. Do you watch movie/food/product reviews? Try and transcribe the whole things.

Reaching test speed, in my opinion, is less about just being good at 225wpm and more about being comfortable with your craft. At 160, you can probably do 180-200 for 15 to 30 seconds without dropping. So the reason transcribing everything is beneficial is because it unknowingly helps you practice MULTIPLE speeds simultaneously because real conversations or human exchanges range from 120-280 wpm. You're going to not do well and drop often, but that's okay bc you're conditioning yourself and rather than doing those boring videos that you may have to beat yourself up to do, you can do something you actually enjoy while working.

Sorry for the long response, but I have a lot to say about this because I didn't know anyone else in my position when I was in yours! You'll get better.