I would suggest separating the second part from the first one, especially if they're targeted to separate people. It can make it a little hard to convince someone the second part isn't related to the first part. Also, it's a little to late to do marketing now that you already released it, and will soon be off of the recent page and other visibility boosts that new games get. I also linked to a blog that is a great marketing resource. Do know that it is mainly targeted to having success on Steam, and if you really want to reach a more general audience you should release on Steam, but the marketing principles should transfer over. https://howtomarketagame.com/