My google earning is decreasing day by day!

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The more my visitor is increasing the more my adsense is decreasing day by day. Atfirst i had only 45-50 impressions every day but my daily earning was near 1$ from 2 or 3 click. Now it is 200-250 impressions every day but income is only 20-30 cent from 7-8 average clicks. So my ecpm is decreasing day by day & now it is only 4.90$. God knows what will be next but I am still satisfied with adsense. Are any way to get high value ads?