It is not easy by any means! I have this old post with many tips I use. Do not vote on it, but he can work through and try all the ideas.
https://steemit.com/busy/@fitinfun/monday-minnow-tips-for-everyone-from-fitinfun

Since I wrote this I have some more things working, but I need to write another post soon.

Basically:

• Post often
• Comment often
• Develop a network of people who will vote for your posts
• 90% of posts go to contests and challenges
• at least 50% of comments are for contests
• follow and participate in initiatives the give votes for participation
• go for things like sbi and qurator that give automatic votes.
• do what works; stop what does not work.

If your brother needs help or encouragement, he can ask me a question on any post or by tagging me. I will do the best I can to help him.