Here's a run-down of observations and ideas.
1. The colors in the thumbnail are blah / muted because of your use of an uncalibrated colorspace. The file's EXIF reports being created by Lightroom, so I'm unsure how you ended up in this situation. Visit your Export settings and assure sRGB is the output colorspace when creating your final JPEGs. Other useful parameters are demonstrated in the examples section at the bottom of this post:
Recommended resizing parameters for digital images 2. Picking where to focus within this type of image is a difficult decision. I clicked around a bit and decided the sharpest focus was slightly above and to the left of the yellow stamen in the center of the image. I don't know if there is a right / wrong / better location. I've done some experimenting in my own work and have decided the closest portion of the image to the camera / viewer seems to work better in my images. So, rather than the pink above / left of the yellow, you might have picked the petals of the flowers to the lower-right of the yellow. My own eyes seem to fall there naturally / first when viewing the image.
3. In LR, look at your sharpening parameters. The file EXIF includes the LR parameters of a Sharpening Radius of +1 and Sharpening Detail of +75. I'm on LR6 and it seems your LR8 software has some slightly different options / parameters as I don't see a "strength" value. Using a mask value will help. In the Detail module while editing this image, hold your <ALT> key while moving the masking slider to the right. You'll probably get to around +55 to have the sharpening applied to just the fine details of the image. Starting from the NEF RAW, you'll probably want a Sharpening 'strength' in the +50 to +75 range.
4. Along with sharpening, look closer at your Noise settings. The Luminance NR setting in the EXIF shows some customization, and the Color NR looks like the default (if I'm reading the EXIF correctly). This post gives some ideas and demonstration on how to use these two NR tools in LR:
Basics of noise processing To my eyes, it looks like you need a bit less Color and a bit more Luminance in the NR processing.
5. Exposure / LR Basic adjustments - You might visit the whites / blacks / shadows of the image to better isolate the flowers from the background, such as Exposure +0.15, Shadows -35, Whites +10, Blacks -20. You can use the <ALT> key on each of these sliders and see the effect as the highlights and shadows move toward complete black and / or white.
6. Distractions - with the updates in item5, the bit of pink entering the frame in the upper right should be a minor distraction that is cloned away.
Summary - your image capture parameters are good, with ideas to modify being more personal preference / style rather than an area to address. More opportunity exists in the post-processing to harvest a stronger image from the out of camera NEF.