If you want people's advice about any topic, type your question and tag it with #AskFedi, which is kind of like a bat signal for advice on the Fediverse
If you want a post to be shared, try adding "Boosts appreciated!". Some servers may even have an emoji for this such as
By the way, remember that if you want your post shared publicly you have to give it a Public or Unlisted visibility setting. (More info about post visibility settings here: https://fedi.tips/who-can-see-my-posts-in-mastodon-how-do-i-send-dms-in-mastodon/)