That's fantastic that you're set to publish with the hybrid next year, and that you've been able to draw from your time in Prague. I can see why you would choose to go wide for such a readership.
I hired a cover designer and she did a fantastic job. She's fantasy, else I would recommend! I relied a lot on JW and David Gaughran for suggestions, editing with JW and using a formatter (BBeBooks), all of which were great services. Lucid dreaming is indeed fascinating, and I've been writing around that topic to support the marketing.
Oh wow, I'm sure the marketing professional had a wealth of information. I have an endless to-do list, and chip away at it for 30-60 minutes a day. Competitions are a great idea, though I've not had much luck with them myself. I'm sure the marketing professional has told you all about finding your target market, and what groups and podcasts you might try to get involved with. Being a YA author, most of my readers are on Instagram, so that's been a big focus for me.
Keep us posted and let me know when the novel is released!