Look at your Sim's Wants and Fears panel. Fulfill Wants and avoid Fears to get more aspiration points. Fulfilling one Want will reroll the rest, so lock the Want you think you can fulfill next.
If your Sim wants several objects (fridge, toilet, bird cage), buy them all at once for a big boost. If your Sim wants an object and expensive versions of that object, such as a painting, a painting costing at least 1000, a painting costing at least 5000, etc., buying just the most expensive item will fulfill all Wants. Objects must be kept past midnight or your Sim will lose the aspiration points! If your Sim wants something that they can just barely afford, buy it, move to inventory, and delete. You'll get the money back and the Sim won't lose the aspiration points from the purchase.
If your Sim has several career wants, lock one by clicking on it and get the job for the other want; then get the job for the locked want.
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To get aspiration points you just for fill the sims wants (green pictures on the panel) and don't let their fears be for filled (red picture's).
7,000 aspiration points
the wants on sims 2 are things that they want to do (kinda), when you full fill their wants you get aspiration points and if you click on the treasure chest there are things that you can sort of buy with those aspiration points- when a fear happens you loose points and aspiration goes down.
what you can do is type in boolprop testingcheatsenabled true and then just shift click and look for asperation and then click on gold or silver
Here is a cheat for full aspiration in The Sims 2. Type ctrl+shift+c and in the dialog box type maxmotives.