Here is a free to enter competition which is completely relaxed about the format and genre of entries.

The Evening Standard in association with Netflix is running a ‘What’s Your Story’ Competition as part of their Stories Festival which takes place in September 2021.

Entries can be written (up to 1,000 words) or recorded as a video (up to 2-minutes in length).
The story can be about childhood, life or from your imagination but must be original and from a previously unpublished writer. The entry can be written as a short story, poem, screen/theatre play or can even be sung.
The competition closes on 30 June 2021 at 11.59 AM

The prizes sound pretty good. According to the competition website:
The winners will receive a suite of prizes to support them in their journey into the industry. Including workshop sessions with either leading screenwriters or editors, publication of winning stories on standard.co.uk, and VIP access to the festival. The winning pieces will be performed as part of the Stories Festival by well-known writers.

As usual don’t forget to read all the terms and conditions before entering and Good Luck! This sounds like a great opportunity for someone just starting their writing journey.