I make just under your target at the moment, but my site is only around 3 months old and I find exactly the same, earnings seem to drop off towards the end of the month else I would be hitting the target. Bit of a pain.
Like others have said, it's not easy to earn through Adsense but when there is a will, there is a way. Keep getting quality backlinks and use social networking/bookmarking sites to get traffic. You'll soon achieve your goal... Good luck,
What the hell kind of attitude is that? Get a normal job? You mean be a slave like rest of the losers in life...I dont think the OP wants that. What is wrong with working hard to achieve a goal? Oh thats right you sell steroids for losers who want a shortcut to success.....been taking some too have you? I think its getting to your brain...
if you have good niche website with good ad placement and with good traffic anyone can make 500$ + per month but how ...