Make sure you have enough quality content online and use social channels to share your thoughts:
- on Twitter use #Sitecore https://twitter.com/search?q=%23sitecore
- on LinkedIn join the appropriate groups https://www.linkedin.com/vsearch/g?type=groups&keywords=sitecore
- on Facebook use the Sitecore group https://www.facebook.com/groups/6932529533/
- you can request your blog to be added to the Blog Feed https://community.sitecore.net/general/f/11/t/4183
Also offline contribution matters, so participate conferences, user groups and other events. These events can also help you meet Sitecore employees or MVPs.
Recommendation is not everything, but it is always good that someone feels that your contribution is worthwhile, so make sure to have at least one!
TheUpdate: As of Nov 2018 the recommendation can be sent via thisafter logging in to the MVP Application area for current MVPs. Sitecore employees have an internal form https://mvp.sitecore.com/recommendationto submit recommendations.