Mastodon tip: You can reply to your own toots. This won't put your username in the toot, but it /will/ mark your reply as part of a conversation.
Among other things, this makes it easier for others to follow what you're saying, if you're posting multiple toots in succession; all they have to do is click one toot and it'll expand the whole conversation thread.
@noelle So toots don't appear in your timeline if they begin with an @ sign, regardless of whether it's a reply?
@noelle It seems that Replies starting with @-myname still show up in my timeline, so do Replies starting with @-not-the-person-i-reply-to 🤔
Birdsite's rules where simpler (don't show tweets starting with @, which lead to the .@ weirdness)
@remram44 Reply status is weird (and apparently weirder than I thought). Just having an @ in a toot doesn't make it A Reply, but (apparently) replying to a toot, even if you strip the @ out, makes it A Reply, so it won't show up on other people's Home timelines unless they're following the person you're replying to.
So you could start a new toot and @ me, and it wouldn't be a Reply to me - but you could reply to this and strip my @ out, and it /would/ be a reply even without my @.