You could try building a simple “bubble” cloner to help develop more root mass before putting in soil.
Even a very small aquarium pump and a small air or bubble stone in the shot glass might help, but it is good to have the water and root area light proofed, if possible.
A red or green plastic coffee tub with the black lid, cleaned thoroughly of course, can be turned into a quick bubble cloner with the aforementioned aquarium air pump and accessories. A 2-3 inch hole, or maybe a few holes, can be put in the top and foam collars can be fashioned to hold stems in the water. The air/bubble stone put in the water under the clones to deliver oxygen rich water to help create a lot of roots and avoid the roots drowning or becoming waterlogged.
So basically you’d be making yourself a small version of one of these things in the link below, you can also check you tube and you can find tons of tutorials to give you other ideas of how to make bubble-ponics devices, this is basically similar to DWC or deep water culture hydroponics.
Hope this helps,