"If you can tune into your purpose and really align with it, setting goals so that your vision is an expression of that purpose, then life flows much more easily." ― Jack Canfield
The closer you get to your subject, the larger your subject becomes and the more depth of field you need. Set your aperture number higher (for more depth of field !!) and work with less light.
Because the opening of the diaphragm has become smaller, we receive less light!
We can solve this by increasing the ISO value. (Small ISO-value gives little light, and a larger ISO-value gives more light in the end result !!) (Do not set the ISO value higher than half the maximum value to reduce the chance of a blurry photo !!) If it is still the case that the subject is not completely sharp and only the front of the subject, then you may be too close to the subject!
Hope you can do something with it and success.
Greetings from the Netherlands and have a very nice day.