How can we reach to our potential customers?

We are a product development agency that provides Product Management, Design and Development services. There are various freelancer platforms, but it is really hard to find proper projects. Some of them trying to outsource with cheapest price, some of them doesn’t have any idea about the software projects. Do you know any isolated platforms provides projects of good quality that you can make proposals to them as a team?
I’ve been trying to reach startups via Angellist too. Investigating Jobs on Angellist, then offering a team service for a position. Developer cost is for a startup around annualy 100K dollars in US. We can give provide same development output in three months and %40 cheaper.And it is flexieble service that includes product management,design and development disciplines.
Outsourcing is hard to manage, especially when the company want to hire freelancer one by one and creating a new remote team. Every new project has three month baby steps phase, generally ends with re-start decision whole project from scratch. Teams learn from mistakes, understand project, creating better solutions. But there are common mistakes, that always and always experienced in start-ups. If someone have worked in Start-ups from scratch, can understand what i mean.
It is an idea about supporting start-ups from idea level to their MVPs. We identify ourselves as start-up too, and testing our ideas in various platforms, trying to reach customers with idea level startups, early stage start-ups, or trying to add new feature or application to their products.
Crew.co is similar business model with us. But we want to develop into various technologies like Mobile,IOT,VR,Big Data and design digital experiences in these areas. Besides being expert on one particular technologies, we want be expert on grasping new technologies and methodologies.