If you over watered then the last thing you want to do is dome them to trap the moisture in, keeping them wetter for longer. You want wet/dry cycles. Let the soil dry up, pick up the little starter pot and don’t add any more water til it feels very light, then water fully til a little water comes out the bottom, get rid of any runoff from the tray, don’t want them to sit in it and absorb more water, then let dry and repeat as needed.
What brand of potting soil are you using?
Check out the beginning of my journal where I cover taking care of seedlings.