That feeling of clarity is quite something eh!!
I'm hardly an expert as i've only had 5 lucids, none of which lasted longer than ten seconds, but i would suggest you maybe got too excited?

There's a good general dream stabilization guide here : Dream Stabilization and Clarity Tutorial - Lucid Dreaming - Dream Views

I'll also bee keeping a keen eye on this thread in case anyone has other tips on managing to stay in the dream longer!

Congrats on the first lucid