Hi,
Given information is light here.
You said what you want but not what you've done.
It won't be easy to help you in that situation.
In your case you should at least post your ~/.config/i3/config and ~/.config/i3blocks/config (or whatever name you gave them)
First did you read the given example by the readme on GitHub page ?
The hacker-friendly status_command for Sway and i3 - vivien/i3blocks
github.com
Then did you follow instructions listed in the "getting start" section ?
The hacker-friendly status_command for Sway and i3 - vivien/i3blocks
github.com
Also do not hesitate to the launch i3blocks in debugging mode, it helps a lot to find what's wrong.
The hacker-friendly status_command for Sway and i3 - vivien/i3blocks
github.com
Once you've done all that you should be able to at least get one block to work, then slowly build others step by step, depending on how you feel comfortable with the configuration files it can take time.