My expertise is in helping expedite business outcomes.
The best advise is to tell your prospects of the unique value of your service or its unique positioning in terms of how it will help your customers. You need to articulate compelling propositions that are irresistible and sustainable. It should be better than your competition and communicated strongly.
A two sided service market place it a tough spot. You have to address two big audiences, who may have totally different characteristics, messaging need, and business development strategies.
Before your Go-to strategy you need a compelling story, a mission, and a vision. You also need to articulate a business strategy encompassing both ends of your business model.
The go-to strategy will evolve from your business propositions, market, business model, and audiences. What kind of freelancers you are taking about - professionals, technicians, labor et al. Who is on the other side of the market place - individuals, households, businesses-small/medium/large/government et al. What is your revenue model and business plan. How strong is your competition? How strong are you versus competition? Do you want to go for the whole market or a niche depending upon your SWOT? How are you different from Fiverr, Upwork, Clarity, and the like or unlike? Your go-to strategy should answer all these questions at the very least.
You may find better and sustainable success going this route.
Hope this helps and let me know if I can be of further assistance for the above. Best wishes.