There are good reasons for not doing National Novel Writing Month (NaNoWriMo). Like, you don't really want to, you're not interested in writing, you don't have anything to say, or your writing activities are progressing in other ways. NaNoWriMo is not for the faint of heart - it's fun, but it's also exhausting and hard.
My point is, it's OK to not do it (particularly if you've done it before, you have other writing projects you're doing in different ways, etc).
But there are also bad reasons for not doing NaNoWriMo. Like, you're afraid it'll be too hard or too tiring. Or you don't think you'll be able to do it well. Or, you've always wanted to write, but aren't quite sure how to start. I'll tell you how to start: sit down and put words on paper. It really is that easy.
I do hope lots of you will join in with NaNoWriMo this year. I hope you'll have a lot of fun with it! But it's OK to not, of course...