Congratulations on completing the Introduction to IoT: AmbiLamp Project.
Hopefully, now that you've touched everything involved in this system - the web app, the API, the database, the hardware, the enclosure, and the embedded code - you have some idea of the parts you loved and the parts you were less interested in.
Our goal at PiB is always to encourage people to make building a hobby. Find what you're passionate about, be empowered and inspired to create things.
Go forth and delve deeper into your favorite topics - we've linked to some of our related projects and tutorials so you can dive straight into learning more!