I've been doing this a lot over on https://lemmy.world/c/coys. I mostly post directly from my Mastodon account.
Sometimes I have to jump over and use my Lemmy account because, for example, you can't post links (that I know of) in the same way you can directly on Lemmy.
https://vijayprema.com/using-lemmy-from-my-existing-mastodon/
I've been doing this a lot over on https://lemmy.world/c/coys. I mostly post directly from my Mastodon account.
Sometimes I have to jump over and use my Lemmy account because, for example, you can't post links (that I know of) in the same way you can directly on Lemmy.