Too much of nitrogen (N) and what should/can I do?

Take some days with water and add a little more humidity. It's abit to low at this stage, so it means that the vpd is Abit high and they take up more nutrients from the soil. But sometimes to much nitrogen extend the veg. periode. So hopefully nothing to worry about if you fix it. 🤛

Looks pretty much like you have the answer. To much Nitrogen. There is a bunch of sound advice from the answers you have already . You have learned something for your next grow, autos don't need as much as photoperiods do.

Yeah you're giving her a sweet tooth brother. Definitely drop the sugar for now.

plain water for 7-10 days ( at least few watering cycles ) or just transplant her into bigger pot, then just plain watering again, but your plant will recover way faster. yes its nitrogen toxicity. but far wrom heavy or worst , only bacterias or root stimulators should be given to her , soil has plenty of goodies for such small plant still.

Severe nitrogen over dose. Give just plain water for the next 10 days or so and when you resume feeding, use only half to three quarters the strength of what you were giving previously. Autos can usually get by just fine on half to three quarter strength as recommended on the bottles, especially in soil. In soil, a schedule of plain water/plain water/feed/plain water/plain water/feed has worked well for me for over 35years. Also, the pots you are using are waaay too small, transplanting into larger pots using a mix of soil, coco coir and perlite may help your plants recover faster. I would not flush, this can cause more (real) problems than cure any (perceived) problem, but I would not be punishing them further by witholding water.

Plants have no excretion process.. so all you can do is wait for the plant to use up those excess reserves in the leaves. Reduce how much N you add in fertilizer as best you can. It doesn't have to be zero, it just has to be less than what the plant uses over time and that will cause a reduction in leaves at a variable rate relative to the difference. I'd choose whatever part you mix that has largest N component and least impact on other nutrient molecules given. some brands may not be easy to do this.. it's not about the name on the label. it's about the ubiquitous commmdities used as ingredients and they are all from teh same pool as any other brand's choices. There are no magical ingredients or different grades of nitrates or ammonium etc.. it's all the same quality.... excluding potentially highly volatile "organic" products that cant even give a guarnanteed analysis label.