When you going to stumble your post always post it in right category. Don’t just select a category for saving time. Post in right category.
Give more tag. That means in keyword or tag section write tags as more as you can. First write important keyword, then less important. Fill this part properly.
In comment section make nice and good looking comment for your post. Comment should be attractive to attract visitors. So use all your creative power here.
Participate in the community. Stumble others websites and keep making a good relation with them.
Stumble not only just your blog post. Whenever you find any good post anywhere just stumble it. Never hesitate to do it. It is free. This will increase your popularity in the community.
Give one hour daily in stumble upon in stumbling. You will get very good information from it. And information is the main power of a blogger.