What is the most cost effective route to take?

Additionally, Miami has seen an increase in demand from international buyers, which has driven up prices and the exclusivity of properties.Sarasota: Although less known than Miami, Sarasota is attracting investors due to its tranquility, proximity to beaches, and the opportunity to acquire luxury properties at more affordable prices than in other areas.

In my case, I am encountering this problem and did not effectively perform the BRRRR as best as I could have.

Taking 'effective' action is what you need to do next, find out what your goal really is and work backwards in discovering what you need to do to achieve it.

Google ads (not free but can be effective when done properly)4.

Rarely is that effective or provide an accurate depiction of the neighborhood characteristics.

No previous tenants or current tenants complain of the mold issue or have any side effects of the mold.

Wondering if they are as effective as the website indicates? 

I'm in Chicagoland and we have what I call a "seasonality effect." 

Start by targeting your audience more effectively—hone in on vacationers, outdoor enthusiasts, and families that would love your location.Also, consider looking into property management services that specialize in short-term rentals, or even investing in some marketing tools to help boost visibility.