Need help giving advice

So I’m the type of person where if I see something wrong with you, I will try to help you by giving you advice and just listening when that’s all you need. But lately most of my friends are getting more depressed and I don’t know how to help them anymore. I tell them things about God and how he will help them, quote from the Bible, (things like that) but its like they don’t even hear what I’m saying anymore.

They always come to me with the same problem of how they feel but I feel so guilty because i feel like maybe I’m not trying hard enough. I just don’t know what to say anymore and it makes me scared because I don’t want to loose another friend due to depression.

Can someone please tell me the right things to say and how to help them when they need it the most? Prayers would also be helpful for me and my friends so we could all keep going.