First, Welcome to Flyertalk kirov42!

If you are earning PLT with AA it seems you are doing it right. If you want some advice on how to price your mileage read this.
Here are some ways to earn more AA miles, try what is right for you:

1. You might want to consider signing up for the Citi AA Biz card that would net you 75k aa miles. Read thisFlyertalk thread.

2. Fidelity has 50k AA bonus miles for opening a brokerage account. Read this flyertalk thread.

3. Online Banking with Bank direct. 100 miles per month for ever $1,000 in Mileage Checking Acct. Read this thread.

Finding a good "return" for your miles is a bit tricky if you do not first find how much those miles cost to accumulate. Business Awards can be a good deal if you paid less for the miles you are using than the cost of the ticket of your award flight.

I hope I gave you some useful information in your quest to maximizing the rate of return on your AA miles.