The first post is where channels stall. It feels like it has to be special, and the channel does not launch for weeks. The requirements are lower than people assume.
The welcome post is usually wasted
"Hello, this is my channel, it will be interesting here" is read by nobody, including the people who subscribe later. It answers no question the reader has and occupies the first slot in a feed that could carry something useful.
Who you are and what the channel is about does need saying — in the description and the pinned post, which is where people look for it: channel presentation.
Four formats that work
A specific problem, taken apart
Answer the question you are asked most often, properly. Such a post immediately shows what the channel is for: it is useful to someone who does not know you.
The mistake you see constantly
"What people usually get wrong" is read because the reader checks themselves against it, and it demonstrates expertise without the words "I am an expert".
A personal story with a conclusion
Works when the story ends in something applicable. A story for its own sake does not.
Someone else's example, examined
Take a public case in your field and explain what was done well and badly. Easy to write, easy to read, and the level shows immediately.
Length
Short enough to read on a phone without effort. A long first post is not a sign of seriousness; it is a sign that nobody edited it.
How many before traffic
Enough that a visitor sees the channel is alive and understands the subject — in practice a handful, not one. Driving people to a single post is the fastest way to spend a budget and learn nothing: buying ads.
Where to take the rest of the material from: a content plan that survives.
How Neurogram does this
Everything above is manual work that runs into the number of hours in a day. Neurogram does it on your own accounts and without you: it collects channels and audiences, writes comments and replies with a language model, and keeps limits and quiet hours so the accounts survive. See pricing or look at your case.