What are effective marketing strategies in really competitive markets for a SaaS product?

SaaS products are a wide range of products, and you cannot take a single market strategy for all of them.

You need to take a strategy for each product or a set of resembling products.

By the way, whatever your products are your strategies can't be out of three major types of strategy.

You need to know if your product needs to compete in which race; price, quality or niche.