Hi, I wonder if you can help me

I applied Lawn Feed & Moss Killer granules in hand spreader box to my 70 m2 lawn.
Did my best not to over apply the granules and watered after 2 days.
That was 3-4 weeks ago. Now the grass almost stopped growing and there are yellowish stripes which follows the granules spreading pattern.
Looks like I have overdosed it.
What to do now? Is there anything I can apply to remedy that?
Any advice will be apprieciated
rafal