Consistency of font would matter more in a novel series. Disparate titles by a single author does not need uniformity of font.
The chosen font should gel with the overall aesthetic of the novel cover. That aesthetic should support the themes/tone/mood of the novel.
I would worry more about attracting readers to pick up a single novel before concerning myself with branding.
If they get that novel in hand and love the story, then they will seek out more by that author.
Your content will be your brand, not a font.
So you have to think like an agent/publisher in one respect - their goal is “get that first novel in the reader’s hand/e-reader”
“Bird by bird” as Anne Lamott says.
As far as the large name thing.
Giant names on covers are more the realm of hugely successful authors that churn out tons of bestsellers. King, Roberts, Patterson, Steel, Grisham…
These are the authors whose books are sold at drugstores and newstands, because they can sell on name alone.
A newer author’s name splashed across a cover as big as the title means nothing to readers.
More and more readers are influenced by visuals - mood boards, Pinterest, Instagram. Capturing the spirit of a novel to appeal to these readers is easier without a huge name across the cover.