Depth of field is affected by aperture, but really tiny apertures can result in diffraction of the light (leading to softnes or less sharp images. Optimal sharpness can be tested for individual lenses. Softness due to diffraction often starts sooner than people think as the opening gets smaller.
For the homemade landscape challenge, you probably are doing close up or macro photography. This often is associated with a shallow depth of field. It may useful to note that depth of field is affected by distance to your subject (focus point). Here is a tutorial that might help with the concepts: link . With an online calculator like this calculator, you can test your expectations. Can you back off a bit to increase depth of field then crop away the surroundings?
You probably will find that your difficulty with depth of field relates to physics as much as or more than your skill. Just the nature of macro photography. "Focus stacking" is a good search term to use for more information about combining nearly identical shots taken at slightly different focus points.
Another alternative is to focus on the best point in your little landscape so that the out of focus areas enhance your image by directing attention to the most important part of the subject. Artistic intent can allow this, even if your first thought was to seek uniform sharpness.
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