Hello Sonam,
There isn't a way to convert a Peek recording to try-mode slides because Storyline 360 needs to be able to detect the user's input during a recording to properly generate the try-mode slides.
If your recordings are appearing as blurry when converted as slides in Storyline 360, there's a chance that the cause of this is a mismatch between your project slide size and the resolution of the screen that you are recording. See this article for more details:
If your slide size is 700 x 540, you'll want to make sure that the screen size of your recording is as close to 700 x 540 as possible.
Let me know if matching the resolutions fixes the issue for you!