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You can air dry Ivy leaves quite easily, just lay out on a few layers of paper or paper towels and allow to dry.

You also can press the leaves between layers of newsprint.

Keep the finished project away from direct sunlight, as this will fade the Ivy.

You can generally repot houseplants any time of year that they need to be repotted.

Only use a pot size about 1 inch larger in size then the current pot with a good drainage hole.

Use good quality potting soil.

Here are some links to help you.

https://www.gardeningknowhow.com/houseplants/hpgen/learn-more-about-repotting-houseplants.htm
https://www.gardeningknowhow.com/houseplants/ivy/indoor-ivy-care.htm

If your plant is in a pot it may need repotting and new soil.

Also if the plant gets long tendrils it may need pruning to keep the plant healthy and in good shape.

You can use a half strength fertilizer on the plant to give it some help.

Insects can sometimes be difficult to see. Spider Mites are common on Ivy.
The plant can be treated with Neem Oil as it works as both an insecticide and fungicide.

Here are some links for you.

https://www.gardeningknowhow.com/ornamental/groundcover/english-ivy/english-ivy-plant-care.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

Choose a container that is only one or two sizes larger than the existing pot. Make sure it has good drainage holes.
Use a good quality potting mix.
Water the Ivy plant the day before you make the move to make sure the roots are moist and to reduce transplant shock.
Lift the plants and move them to the new pot.
Water the plant well and allow it to drain. Ivy like to dry slightly between waterings.
Follow the care information in the link below.

https://www.gardeningknowhow.com/houseplants/ivy/indoor-ivy-care.htm

Yes, a change to a different environment can cause stress to the plant.

Inspect the plant more carefully and look for signs of insects.
I suspect spider mites, as this is common on Ivy plants.
Treat the plant with Neem Oil.
Neem Oil is safe for people and pets and will take care of any insects or fungus.
Here are some links to help you.

https://www.gardeningknowhow.com/houseplants/ivy/indoor-ivy-care.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm

A water soluble nitrogen rich fertilizer applied once a month during the growing period.
Here is a link with more information.

https://www.gardeningknowhow.com/houseplants/ivy/indoor-ivy-care.htm