Answering user questions
Answering user questions is the most direct way of helping users. It also will net you the most "thank you"s
If you know Audacity well, but don't want to write tutorials, you can try helping users out directly. The most active community in this regard probably is the Audacity Forum, but you'll also find users in our Discord community and on the audacity subreddit.

Tools

There is a tool available to recover broken projects:
GitHub - audacity/audacity-project-tools
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