A bad Donkey Kong slump? Yeah, I like to refer to it as my entire DK career. It's lasted 30 years, with no signs of letting up.
Self-deprecating humor aside, I think what you're experiencing is all too common. Many players struggle with a number of plateaus in this game. When you first start out, you make a lot of rookie mistakes. You learn to correct them, and your scores steadily increase. At some point, you hit a wall, where you feel as though you've stopped improving. The 150-200k range seems to be fairly typical. However, if you stick with it, you'll eventually overcome that first roadblock. As you continue to play, you'll gain experience, and with it, more confidence. Once again, your scores will begin to climb, until you reach the next hurdle. And so on. Of course, your current "slump" may be the only plateau you encounter for a long while. Once past it, you might have that breakthrough game where you eclipse your personal best by 400,000 points. It happens.
More encouraging news: if your current best is 207k, and you're not doing much point-pressing, you've made it past Levels 5 and 6. If you can complete those 2 levels, you can finish them all. The game doesn't get any more difficult (although the unforgiving nature of the randomness might make you believe otherwise).
I had one horrendous streak almost a year ago. It was so bad, I had to document it. Over the course of a weekend, playing on MAME, it took 144 restarts to finally reach Level 5 without a death. I couldn't buy a clean start. Aggressive point-pressing, conservative pressing, running boards, single hammer, double hammer, high risk, low risk; it didn't matter what I tried. Thank goodness that's over with.
There are many ingredients that contribute to success in this game: analytical skill, reflexes, precise execution, timing, peripheral vision, etc. Two that are occasionally overlooked are persistence and experience.
Good luck!
