Text adventure authors generally tend to work solo, but it doesn't always have to be that way. What are your strengths and weaknesses. Are you good at programming, writing, designing puzzles, graphics? You did say that you're a writer, so I assume you can write, but can you design the plot for an interactive story? If so, what genre do you prefer? Crime, horror, humour, sci fi, mystery? Remember that this year's comp has an optional theme of 'fairy tale', so that may give you some ideas.
I think your best bet would be to write a brief outline of the plot and see if anyone is interested. Consider the time and place that the story takes place. Draw a map and write some location descriptions. What objects are scattered about the environment. Are there any non-player characters? How does the player interact with those objects and non-player characters? What is the ultimate goal and what are the obstacles that prevent the player reaching that goal?
Most importantly, think about what you can do yourself and what you expect someone else to do. If it's a collaboration, all team members should share the workload equitably. Or maybe you just need a teacher to guide you?
Anyway, give it some thought and post back here. You can also join the Discord server (if you haven't already) to exchange personal messages with potential collaborators.