What about the good but abandoned proposals?
Ask for permission, adopt and post all posts that have a score > 1 and no activity for a month.
Give people notice first
Before VTDing a post, comment this:
Canned message to comment to to-be-deleted posts:
This sandbox post has had little activity in a while and little positive reception from the community. Please improve / edit it or delete it to help us [clean up the sandbox.](https://codegolf.meta.stackexchange.com/q/12792)
Whatever action is taken, if it isn't "No action" then it has the potential to be incredibly disruptive. The same principle applies as with big retagging projects: if everything is tackled at once then it floods the first page with trivial changes, burying new content.
If 50 posts are edited as a result of their owners responding to warnings about possible deletion then all recent sandboxed posts will be pushed back two pages, and the amount of "new" material will be so much that some of the ideas which people are trying to save will not be reviewed.
In short: doing this badly will exacerbate the problem it's trying to solve. Do not rush.
Also delete (with warning) all sandboxed posts with no activity for 2 years and a score of 0 or less. We would delete 156 posts.
Remove (with warning) posts with a score of 1 or less and no activity in 3 years.
Why remove posts with an upvote?
Many times, they were drive-by upvoters.
When removing posts with a score of 1, leave this comment:
This sandbox post has had little activity in a while. Please post, [offer it for adoption](https://chat.stackexchange.com/rooms/60187/abandoned-challenges-up-for-adoption) or delete it to help us [clean up the sandbox.](https://codegolf.meta.stackexchange.com/q/12792)
Adoption chat room
For all the good but abandoned proposals, post them in the adopton chat room!
Ask for permission before offering for adoption
Hello! This looks like a good but abandoned meta post, would you be willing to [offer it for adoption](https://chat.stackexchange.com/rooms/60187/abandoned-challenges-up-for-adoption)? (If you want to, you can still post to main.) Due to community guidelines, if you don't respond to this comment in 7 days I have permission to adopt this.
Also, add this message to the top (when you have permission):
> This message is open for anyone to adopt and post to main. For more details, see the [chat room](https://chat.stackexchange.com/rooms/60187/abandoned-challenges-up-for-adoption) or [meta post](https://codegolf.meta.stackexchange.com/q/12792/58826).
When you post an adopted post to main, please give credit to the author!
I also suggest that we delete (with warning) all sandboxed posts that have a score of -1 or less and no activity for a year.
How you can help:
Sort your pending proposals into 3 categories:
- Trash. These are the mass-downvoted, low quality, or no longer on topic questions. Keep in mind that many once-popular categories have fallen out of favor.
- Need work. These are the ones that show promise but aren't quite complete yet.
- Ready to post. These are the good questions that are ready to post now.
Once you have sorted them, do this for each:
- Remove these, and edit them to their title only. Remember, only you and mods can delete a post with a positive score, so please delete them.
- Edit these to bump them, and ask for feedback from the community. When they are done, do #3.
- Post these to main, and delete them.
Remember, when you delete a post please edit them to only their title for the benefit of those with >=2k rep.
I suggest that we delete (with warning) all sandboxed posts that have a score of -1 or less and no activity for a month. The community doesn't like them, mobile users' phones "lag hard", and they are not useful.