Do not let all your hard work building your website, writing articles, buying traffic, generating traffic, sending emails and all the other things you did to generate sales go to waste by sitting back during your second month and doing nothing. Yes, what you have done so far has worked and that's great, but it only worked because you worked, you made it happen. If you do nothing, you will get nothing.
So, go back to the drawing board, evaluate what you did, from your test results work out what worked well and what didn't and plan your next month from there. Perhaps you could write an article on how well your first month went, what worked and what didn't as I am sure others in your situation would want to know of your success and more importantly, how your success was achieved.
You will appreciate the importance of recording and testing any marketing techniques when it comes to analysing the results the following month. You can only know for sure where to spend your marketing budget if you test, record and evaluate the marketing methods you have used.
Widening your marketing mix will make sure you keep ahead of the ever changing 'internet age' but make sure you test everything you do so you only spend your budget on things that work.
It is essential to set aside specific time each day/week to actually work on writing articles, running pay per click campaigns and so on will help to maintain momentum and keep sales coming in. Maintaining 'bread-and-butter' marketing methods each month will generate sales which will then allow you to experiment with other methods which you can then evaluate and build your overall marketing mix over time.
Learning from other business owners what works well and what doesn't can cut out lots of wasted time and money which is where good quality internet marketing training really does pay off. Training is essential to ensure your don't waste valuable time and money using marketing methods which simply don't work very well.
There are also lots of software on the internet which can help you put your website together more successfully. Using software like sales letter generators, keyword generators and web link generators can really boost sales. All these kinds of software can boost your search engine rankings and skyrocket your sales, they just need a regular amount of work each day/week to really see some consistent results.