This is the effect you get from shooting at f4 i.e. shallow depth-of-field (DOF).
If you look at the regions, the red one is 'sharper' than the green one or the white one. If you look closer at the green one and the white one, as you look from the center of the image out to their respective edgee, the 'sharpness' fades out evenly -- based relatively from where the camera was held.
If MDM is online today, he can show you some PP (post processing) ideas to remove softness. In the film days. photographers used various techniques to 'fix' the images such as unsharp mask and other contrast enhancers. Digital photographs sometimes need that same approach.
From the taking-the-shot perspective, for things like you have here, try using more DOF by way of increasing the f-stop. Start at say f5.6 or f6.4 and go up from there, but do not be surprised to find yourself shooting at f11 or so. There is also a technique called 'focus bracketing' that can be really handy for shots like this.
Do not be afraid of boosting the ISO to keep the image from being dark, the X-T4 has plenty of noise free latitude. Of course, there are tripods.
Uhh, at the risk of changing the subject, if you are intending to print these, try changing your camera settings to 300 dpi over your current 72 dpi and use the Adobe color space instead of the sRGB color space. But why do that is the subject for another different thread.