Patches do not fall off very often. But if the patch falls off do not worry about it. You can stick the same patch back on if it has been less than 24 hours, and the patch is still sticky. Or you can use a new patch.
DO NOT use bandages, tape, or adhesive to make a non-sticky patch stick. The hormones that keep you from getting pregnant are mixed with the adhesive, so if it will not stick, it is also not going to be an effective method.
Try this: make sure you do not use any lotions, oils, powders, creams, or medications on your skin where you put the patch. Using lotion or oils after bathing can interfere with the patch sticking as well.
Still not working? If it keeps falling off, maybe you want to try a method that goes on the inside. Maybe implant, an IUD, or ring
Try a different method: implant; IUD; ring.

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References:

1. Reproductive Health Access Project. (2015). THE PATCH. Retrieved from https://www.reproductiveaccess.org/wp-content/uploads/2014/12/factsheet_patch.pdf