hi, welcome to the board.

Congratulations on your lucid ability, i wish i could do that!
You say you can remember your dreams, but that two or three hours later you struggle to remember them. Well, that's normal, because reality kicks in and life gets in the way.
The best piece of advice i can offer you is to start keeping a dream journal. When you wake up in the morning, write down whatever you can remember. At first, it might be hazy, until your brain gets used to making a conscious effort to remember. This doesn't matter. Just write down whatever you remember, even if it's only an emotion.
As you get used to writing them down, within a couple of weeks you should begin to see dreamsigns, which are elements in a dream which tell you that you are dreaming.
For more information, check out the attaining lucidity, dream control, dreamsigns and dream recall section.
These should help you!