Do you take your writing seriously? Or, more to the point, do you take yourself as a writer seriously? It's all very well writing every now and then or going about it half hearted and then being disappointed with your writing output and wondering why all you've got to show for your minimal efforts is a pile of rejections.
To be a successful writer you have to keep at it, writing regularly and writing well. In the magazine world unless you are pitching regularly, the likelihood of you being published is reduced. And once you have been published by a magazine don't let go! Keep reading that magazine and keep pitching. If they have used your work before, they may be more inclined to use your work again. But if you leave it a long time between pitches, they may well forget you - so keep going.
The keep going approach is useful when you keep having your pitches rejected or no reply at all. By pitching regularly to the same magazine you are showing that commissioning editor that you are not just a one pitch pony. They might not have commissioned an article from you previously but that doesn't mean with a little tweaking and persistence that they won't ever.
So for the month of May I'd like you to take yourself and your writing seriously, act and work like the professional writer you are and keep going.