1.You must own your sells and communication channels. Depending on third party platform is non reliable.
2.Do your business math, there is always a risk factor in hiring/growing your team beforehand.
3.If I am in your place, I will focus on being the best at what you do now and care for expanding the business later.
4.The better strategy is to search for bigger projects that you can showcase in your portfolio.
5.Your team structure will change according to types of projects that you work on.
6.Nice portfolio with clear copy and SEO. Blogging on social media on relevant topics.
More insight that I can give:
Put customer relationships on the first line. Underpromise and overdeliver. Say no to clients without fear. Rase your rates accordingly.
I hope this helps. Good luck.