I know plants cannot handle overfertilizqtion but by mistake if it happens then what to do. Because plants leaves are falling stems are burning

So can you suggest me hoe can I rectify my error?

If you have "good drainage" you can do a flush. Myself, strictly 1 - 1 - 1 fish emulsion fertilizer, occasionally dried blood, a little screened wood ash, maybe some iron, and lime for a pH check. Also diatomaceous earth for bugs.