Writing to a prompt can be hard--I struggled a bit with what I got both years. But it led me to write stories I wouldn't have otherwise, so for me the struggle itself was useful. Maybe you could try Spring Fling first and see how it feels? I find it less stressful because the maximum is 2500 words, and the prompts are limited to a single word or phrase, so they can be interpreted very broadly.

ETA, because I just realized I didn't actually say it: Dude, your writing is great, and challenges are a good way for more people to see it.