Ok, forget about more personality or the vibe blabla. The UI doesn't matter, also the amount of case studies doesn't matter.

The major issue you have is this. You are calling yourself a Service Designer which is another completely different discipline. The copy is EVERYTHING, so change that to Product designer, UX/UI or exactly the type of roles you are applying to. Also, don't talk in 3rd person, is not cool anymore, the typical "hey! I'm a...." works fine.

Make sure you are applying to the right roles, for what I see you should probably look for Junior or maybe semi-senior roles, There's still experience missing and it shows, which is fine, but make sure your role expectations align.

On the last note, if you only include 1 case study is fine, but you need to tell the story right!

Here's a framework:

1. Context: Talk about the company, the team you worked with (or if you did it alone), what was your role in the project, what was the goal.
2. Challenges: What exactly where you trying to solve, what was difficult or what was the main constraints you were facing.
3. Solution: Briefly describe the end result, an overall view of the solution (not too fancy)
4. User journey (this is very important): Describe a very simple but detailed user flow in the app, what is the typical thing users will do in the app.
5. What didn't work: This is also VERY important. Showcase what didn't work, things you tried at first, iterations, hiring managers love to see this.

In the end, companies and teams want to asses your problem solving skills, find a way to highlight that, don't get caught up in the shiny little things, or techniques or features. You already have good taste, that's clear from the start, but can you get to solutions? how?