I wish you well in your search, A few of thoughts, You could try advertising with a Call of Cthulhu listing but explaining that RQ uses a similar rules system but in an ancient world setting and it would be easier to convert. The Twitch Streamer Bluejay712 took part in a live stream for RuneQuest Glorantha a few weeks ago so is familiar with the game. I feel that she would have a lot of sympathy for were you are coming from and if you reach out to her may let her put the message out among her community. I would also reach out to Chaosium, they are a friendly bunch. In the last few days have shared a blog from a new player who was a woman, so increasing the diversity of the player base is on the radar. Don't expect an instant reply though. Don't hold back from giving GMing a try, it may feel as if you need an expert because of the amount of Lore, but the game works with mythic archetypes so intuition is as good as knowledge. I would seriously recommend asking Chaosium if you can have a copy of 'Stealing the Eye' the convention scenario that they have been using this year, it is very short but it is well explained and uses the Quick Start rules.
