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Possible reasons: 1. Your competitors' ad is performing better than yours 2. Max cpc value must be higher than the one that you have set 3. Quality score of your keyword is decreased

@Sahil Gupta have a check at the budget also as google has cap at month end sometimes by the last week most of the budget is exhausted. If the impression share is same but absolute impressions have decreased the search interest might have dropped for the keywords

Check the google trends for the keyword Interest over the time

@Meet Sarate agree your all point you have mentioned. one more point i added sometimes issues ad copy policy violation, so we need to check this parameter also.