Suggesting tags for new content

Arising from this discussion [Discussion] It's all about titles drag and drop to set config and lists - #3 by TW_Tones

Each time we add new content to our wiki we can provide the content with context by adding tags, even the simplest form, a table of contents can be used to place that new content under an appropriate heading or subheading. For example a new healthy recipe may be placed under Health, Cooking etc…

It would certainly be helpful if the new content title and text was used to search the existing tiddlers, or items in a TOC to ask or recommend suitable tags to apply, to the new content.

The Question

Can anyone suggest a search pattern to use, perhaps limited to the existing tiddlers in the TOC and as a result suggest some suitable tags?