Question for IT Founders

Hi

I am running an software agency (4 emoloyees in total) and I have 4-5k MRR.

I have not build any sales pipeline so far and I can hope I will be having same MRR for next 3-4 months and in that time I need to develop an active sales channel.

so, question to agency founders, what's working for you? upwork, linkedin, email marketing, or what else?

and should we explore and do multiple channels at once, or focus on one only?

thank you.