Find subtitles for your videos on Captionfy and publish the captions on YouTube
Copy your YouTube channel's link.
Paste the link into Captionfy's search and hit enter.
Choose the captions/subtitles you want to publish to YouTube, from within your channel page on Captionfy.
Click on the "..." button next to the subtitles you want to download, and click "Download captions".
Choose the format of the subtitles you are downloading. YouTube accepts all formats Captionfy suggests.