The most relevant problem and very common in the UI design is the absence of contrast.
I guess the image at the question is just a part of a whole design. Being just that part, it has five different shape typologies, talking just about shapes, not functionality:
- An icon in a circle
- Three "silhouetted" icons
- A tiny inverted triangle
- A blue rounded rectangle
- A split bicolor square
A simple exercise is to see it without noise:
In a simple part of the design there is a whole circus! ;-)
I think you should find some way to unify all this, and perhaps the composition contrasts may be helpful. I add some examples, not designs:
Harmony also make contrast:
The other contrast types are style, direction, space, texture... Maybe the best will be to sit down in front of a graphic application and make different designs. The trial and error aid to see better where the design weak points are and helps to find optimal visual solutions.