I think that the best advice that I can give you to get noticed by big brands is to make them notice you. You may be wondering what I mean by that. Well reach out to them tell them what you think of their company. Tell them why your readers would love to learn more about some great product they brought out. Show them that your are interested in them and they will check out your blog and as long as you have the content to back yourself up then you should be on the right track to getting better opportunities. You can check out my blog Mom Blogger Basics to get more tips.