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What I found, @Loraine , is that the whole “breathing” thing is really important. Really, really pay attention to your breathing AS you sing. So make sure you are pushing from your belly, not your chest. Practice breathing with you hand on your belly and feel it go in and out with your breath. And when you start doing that more naturally with thinking about it, you will have so much more power that your voice will naturally start getting stronger.
After you have gotten to that point, pay attention to when you breath. There are natural pauses during songs. Make sure you consciously take a deeper breath (belly) in the pause so you have all the power you want during the next phrase. Then do it again during the next pause. At first, you may have to pause between words that make the song sound awkward. But you’ll get better and learn how to breath while you sing. It’s not natural at all and takes effort to train yourself to do it.
I hope this helps. Again, like @Guitargeezer-Jack said, there are a ton of free videos on YouTube that give you advice on how to sing with more power and exercises you can do to strengthen your vocal cords and your breathing.
MG 😀