Multiple posts, similar content, different platforms. Whats the most time efficient way to do this

I have 5 similar posts saved at present are scheduled to go out at at equal intervals in each account. So I've seen I can manually go into each post and just change the schedule manually for each post to make it publish at different times across accounts.
Is this the best way to do it or for time efficiency is there a simpler way of making it random between accounts when I first save and schedule a post for example a news article?