Write the stories you would want to read, not what other people wish the genre would cater to. If you can relate better to a relationship in which the man is dominant, write that.
That said, I find the tendency to write stories about millionaire / billionaire men disturbing. It smacks of shallow greed for money. A man does not have to be a millionaire to be deserving of respect. Nor does he need a million dollars to be able to take care of you so that you can pursue an avocation instead of a paid career. You only need a millionaire if you want to buy a new pair of the hottest shoes every week, jet-set around the world, or spoil your kids with ponies and go-karts.
How about if, instead of a billionaire CEO of a major corporation, he is the founder of a medium-sized non-profit. He's not a volunteer; he pays himself a respectable salary appropriate to someone with his responsibilities, and sufficient to allow him, you, and children to live comfortably. Since his charity is up-and-coming and frequently featured in the news, and since he is handsome and charming, he is still one of the "top 40 most eligible bachelors" despite being #40 among them in net worth.
Maybe he is thoroughly capable enough to be a CEO worth billions in stock. Maybe he had an opportunity to go down that path. He had only to be complicit with a minor breach of ethics, and he would have been on his way, but he was too pure.
For the heroine, librarian is pretty cliche. Not everyone gets to have a job that relates to their passions (or rather your passions, as a reader and writer). If her real goal in life is to be a homemaker, then for now she's likely to just fall into whatever work pays the bills. Maybe she's close to her family. So maybe she has for the past couple years been working as a waitress for her uncle's catering company. Her humble career ambition is to move up to being the assistant chef.
Give her an avocation, too. Maybe she volunteers with kids. Maybe she has a creative hobby (but avoid writing - too self-referential). Maybe she studied history in college and collects antique maps. Whatever. Just something so she isn't passively pining away until Mr. Right comes along.