I often get asked for witness vote so here are how I prioritize my witness votes.
* From 
- Minimum operating requirements (SLA)
- Host a seed node.
- Review new Steem versions and choose whether to run new forks.
- Participate in discussions on hardforks / platform changes.
- Submit regular witness reports.
- Provide an SBD price feed and making informed economic decisions when necessary.
- Participate in discussions on the appropriate values for witness parameters.
- Host a full / RPC node.
- Social
- Communicate your vision for the project.
- Marketing / PR / Recruitment.
- Run or sponsor social projects / contests.
- Educate and help new users.
Build communities.
- -Technical/Financial contributions
- Learn how the steemd code works.
- Submit pull requests for minor bugs + enhancements.
- Develop third party tools and applications for the community to use.
- Fund projects that add value to the community.
- Work on getting STEEM/SBD more widely accepted as a form of payment.
- Develop tools for the witness community to use.
- Help fight plagiarism, spam, and abuse.
- Start new initiatives to make the platform better.
- Push to get STEEM/SBD accepted on more exchanges.
- Good practice
- Use the platform.
- Actively curate.
- Keep in touch by blogging.
- Be a role model for how new users should act.
- If you make a commitment, deliver.