When I decided I wanted to photograph smaller weddings (generally less than 150 guests) rather than weddings of every size, I started tailoring my work and marketing strategy.
First and perhaps the most obvious change was to update any description of what I photograph, whether it was the About page of my website or the bio in my social media accounts. The emphasis on "lifestyle and small weddings" made it clear that I specialize in those areas. In turn, the wedding inquiries I've received since have been from couples who have a smaller guest list.
The next step was to showcase what these types of weddings looked like. Usually, that meant that group photos had less people in them or a bridal party with 1-2 bridesmaids or groomsmen.
Another way to get the word out was by word of mouth. When someone asked about what I shoot, I made sure to mention that I focused on small, intimate weddings so that they have my name in mind when they're asked to refer a photographer.
So far, this has been working to attract the right type of clients and it shows who has done their research before getting in touch.
I hope this helps and if you have any tips, feel free to share them in a comment below or join me on Instagram.