It's like any other business @Jessica1462
Do your market research to identify what you can offer that your competitors can't or what you can do differently.
Identify who is your target market
Identify key benefits for your service
Develop content for and invest in marketing activities to reach your target market i.e. your own website and social media, online ads, networking with local host groups, being active on forums and social media used by your target market.
Do not reach out directly to hosts on their listings. There are those who will see your contact as spam.