I cannot figure out how to move my instances individually. They are placed on each vertex of an icosphere. The path they should move along has that vertex as a starting point (eventually they end on vertices of another icosphere). I thought that a realize instances would work, I later found out that "translate instances" kind of does the trick.
Here's what I came up with (with the help of @Leander).
Though I can't understand why my spheres spread around the original sphere. Then they follow the intended path and that makes me happy.
here's the blend fileport.io/qvYqV9A8Yrtd