Newbie Stem/Leaf problem

I’m not sure if overwatering was the source of my problem but I believe I have fungus gnats. I’ve been using neem oil for the last wk, wk and a half. They have been reduced but I’m curious to know if my plants are still affected by them. I’ve stopped watering from the top and started from the bottom up.

The leaves now have a glossy look to them. Small black specks on the leaves and small white spots on the base of one. Also some of my leaves have some discoloration but having difficulty determining from what??
 

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