If you want to suggest to somebody to read a certain thread on Mastodon you can boost it or interact directly in the thread and call the account of the person that you want to join the discussion (Ok, @Zid1o88@mastodon.social ?😉)
Mastodon decided to not implement the 'retweet and comment' function because is mostly used for harrassment and also because it leads to talking AROUND a thread without taking part of it.
Posting the link of a toot is also ok but remember that this will work correctly only from desktop. On smartphones, unfortunately, clicking on.the link will bring you outside the App to the browser.
Also, always remember to write the COMPLETE account address of users.
@name wil work for peoole on your same Instance, but if you want to interact with people based on other instances the format is @name@instance