I mean it would depend on what platform and all i suppose, but the devs of the project I'm in does lots of "coordinated shilling", things like raiding a telegram chat or commenting on twitter posts.
I really don't know how effective they are? What is the main marketing in crypto anyways?
Shilling works but most form of shilling is happening in the pure spam like they ask you to invest an a project on comment section where there is nothing related to cryptocurrencies are going and also some random group of newbies started to post and talk themselves about the project and claims that they made huge money out of it.
Pay someone with huge social media influence and ask them to shill, this has some chance to work.