Add much more plants
That is gonna flip soon.
You shouldn't uppot autos mate.
Unless you get it done in the seedling stage.
The risk of stunting is extremely high. And most auto phenos grow big such as the pots they start out in. Like I do 11L pot autos and pull 50-100g.
Been an auto. And doing that strain
Add more. All that work. For such a small plant. You have so much space mate.
Thats just my opinion
I do large crops. But, autos I've done in 18L but, they need to be in that pot early pal.
Feel free to DM me, I think most would agree with me when I say, you've more than enough Space