It will be best if you take the fish out. If you remove the crypts, moving the extensive root system will most likely result in water so cloudy you won't be able to see in it for a while.
Peruse the web for scapes that resemble the look you want to achieve and do some research to find out how to support that scape (light requirements, ferts, CO2, flow, etc).
There are articles that describe what makes a good scape a good scape. A couple things include lack of symmetry and off center focus.
The lack of symmetry simply means don't place items (plants, hardscape) in even numbered, equally spaced locations. For instance, placing 4 similar plants on each side of the tank (as in mirror images). This looks "planned" and not natural.
Off center focus means placing a key feature, whether it be driftwood, a pile of stones, or a large plant in the exact center of the tank. This forces the eyes to focus on "this side" OR "that side" of the tank. Think of it as watching a tennis match; not very relaxing visually. Placing items off center allows the eyes to take in all or parts of the scape.
Hope this helps.
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