@Skam0ne
Did you top the ww yet? I wouldn't top just yet if it was mine, I usually wait til the 6th node or higher before I top mine, can you tell us exactly how many nodes high the seedling has now reached at this point?
I would remove any yellowing leaves down towards the bottom of the plant maybe 2-4 depending on what looks yellow, then in about a week or so new growth will appear on the top canopy, then I would top the very tip of the top growth off, but I've noticed if you want a certain node level to trim off, it's better to wait until one node of growth develops above the node that you desire the plant to branch out from.
For example, if you want node 4 to be the top, allow the plant to develop the 5th node completely & wait until signs of the 6th node begin to grow forth before you make your cut. When you do make your cut, try and leave about 1/2- 3/4" inch of stem above where you make the cut to allow the plant to heal.
I've noticed if a seedling is topped too early before it can reach a certain biomass, then it can really stunt the growth for a week or longer, so I just advise patience and allowance of some height to be reached before topping to help avoid negative outcomes as I have mentioned, and you know..... it's not going to kill the plant or adversely effect the over all harvest, but it may add days to the overall harvest if stunting is undergone too early in the seedlings life.
If you've already topped her/him then just maybe use this advice next time around, sorry if I was a bit late posting this tho, I do try to respond quickly if im able.
TakeR eazy yaw.