Decide what the channel is for, in one sentence
A channel that posts whatever comes up teaches people to mute it. A channel with one promise, kept, teaches them to open it. Write the sentence and put it in the description where a visitor decides in two seconds.
Make the first minute worth something
A new member arrives into silence and scrolls back through context they do not have. A welcome message fixes that: say what the channel is, what to do first, and where the shop or the pinned rules are. It costs one setting and changes the first impression of everyone who ever joins.
Post on a rhythm people can feel
Twice a week at a predictable hour beats seven posts one week and none the next. Scheduling exists so the rhythm survives your week being busy, and the analytics tell you which hour your members actually read.
Protect the room before it needs it
One scam link in a group of four hundred costs more members than a month of good posts gains. Anti-spam, link rules and CAPTCHA on join are dull settings that do their work invisibly, which is exactly why they get turned on late.
Give people something to do
A channel where members only read is a broadcast. Polls, reactions and a reason to reply turn it into a room. If you also sell, the shop button belongs in the menu where people can find it without asking.
Read what happened, not what you hoped
Member growth, message volume, which posts moved anything. The module list is on Modules, and what each plan includes is on Pricing. Change one thing at a time, or the numbers will not tell you which thing worked.