I would honestly start listing to the Waste No Day podcast. They have a really good way of building trust through your "presentation" to the client. In short, the client should be talking a lot more than you, you need to be asking a lot of questions, and should only be speaking in to their pain points. Listen to a bunch of that podcast's episodes and you will find your voice.
I'd also recommend finding someone you can role play with. Work on your sales presentation till it's muscle memory. It just flows well. It's definitely not fun to ask someone to do this, even less fun to do it yourself but it will benefit you long term.
