What do u do when u keep trying to help a friend but it seems everything u do or say the friend doesn’t realise it and is ungrateful

The lesson here is that you shouldn't help someone while expecting something in return, even recognition. You will eventually be disappointed.

Give the friendship some space if only for your peace of mind and sanity.

Maybe the friend doesn't think they need help, of more often than not, your offer is pointing out a lack of something they have, and they get embarrassed by that... Help can be a touchy subject

Some things can not be explained, they must be realized. Allow your friend to do as they wish but be there to sit with them if need be.

Back off but make it clear you will be there if/when
they are ready.

They may not be ready yet to hear what you're telling them. They may have to work through some stuff to get to the point where they are ready to realize it and accept it. All you can do, really, is give them the space they need to do what they need to do until they're ready, and just be there for them when they need to talk.

Hope for the best and appraise him with an opportunity