How to make a line between a block and the player

So I want to have a potion effect that creates a line between you and a tag of blocks (I created a tag called metalicblocks) my problem is that I dont know how to make a real line like the one the game shows you when you use a lead with an entity. All I have managed is have a string of particles but that is not what I want. Increasing the amount of particles doesnt do the trick, so how could I do it without particles?

I would like something like this:

But I have only managed something like this: