The Colour of Magic was published in 1983, The Shepherd's Crown was posthumously published in 2015 with up to three books published in some years. It's an incredible life's work.

If you liked The Colour of Magic, I'd strongly recommend continuing reading, it's usually considered one of the weakest novels in the discworld, being the first book he wrote while still having a day job.

The good thing is, there are these sub series as you can see in the picture following specific characters with some cameos from the other series, so no need to read all of them (although recommended, because they're great). Even within these series, every book is basically a standalone story with minimal spoilers if you read them out of order and zero confusion if you don't remember what happened in the last book.

I found a better version, updated.