Hey there @toithanhcong, welcome to STEEM. If you join @schoolofminnows, you can receive votes for free.
1. Your post will appear in post-promotion on the discord.
2. Your posts will also get featured on the school of minnows account on steem
https://steemit.com/@schoolofminnows
3. You get votes from other members.
4. The whole thing is FREE.
To join follow this link:
https://steem.host/connect/steempunks