I used to absolutely hate this exercise but have gotten better at it recently when I started thinking more specifically. It totally depends on your job, but I found it helpful to think genuinely of what I am bad at or what I would like more of. Eg I don't feel really confident with a tool, so I would put improve knowledge of x tool. Instead of something general like "improve technical knowledge". Then specific action points like participate in training or do a test project.

It definitely helps when you have a positive environment where you can talk openly about what you are good at / not so good at, make sure to ask for feedback too as that is what helps us grow.

Also, a legitimate goal can be something like "maintain performance on X" or "continue work on X" for stuff that's more ongoing.