If it were mine? I'd probably do a cozy kinda vibe with warm tones to go along with the theme of the blog. Something that just screams "reading books by a fireplace in the winter with a warm blanket and a mug of hot chocolate" because that's the first thing that pops into my mind when I look at the blog (especially with that Gustave Flaubert quote at the top). I'd probably use darker warm tones just because I prefer more of the darker tones on sites in general, while still trying to get that cozy vibe.
I feel like something along the cozy vibe would work well as a theme overall for your blog though. The name alone just makes me think of sitting by a fireplace and talking, but since we're going for more of a "sitting by a fireplace and reading books" vibe, it still works. Definitely warmer tones, though you don't necessarily have to go for darker tones like I'd do since that's just my personal preference. I think the quote from Gustave Flaubert at the top creates an image that would work quite well as a theme from an imagery and a color standpoint, and it'd definitely be a good starting point.
I'd likely opt for a minimalist, modern theme that emphasizes readability and information hierarchy. I'd prioritize clean lines, ample white space, and a focus on content over flashy design elements.
I think a cozy, warm aesthetic would fit perfectly with the name "Fireside Chats," maybe with earthy tones and inviting imagery. If it were my blog, I'd go for a minimalist design that highlights personal stories while keeping the atmosphere relaxed and engaging. also, choose something that feels authentic to you and resonates with your readers!
Thank you everyone for the suggestions. I've been looking through the themes available from Wordpress. After looking, there's a couple that I like but they cost $$$. If I monetize my forum, I may go that route but I'm currently sticking to free themes at the moment.