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Wotuu As someone trying to push high keys and using MDT for a long time, I don't see the appeal of your website in its current state. But if you manage to improve the "Route listing" page, I can see it becoming a go-to tool for M+ runners.
I really like that you already allow to indicate that a route was created for specific affixes and group setup. It might be helpful to add a text field for free-style comments (to be filled in by the author of a route), so if there are any unusual skips or pulls, they can provide a short description. But that would probably require too much moderation to be viable.
If the website gains any traction, it would be really useful to be able to associate routes to specific characters (authenticated by whatever means similar to Discord's Jeeves bot, if possible at all), and search for all routes imported by a specific top M+ player. Could also find a way to integrate the raider.io scores of route authors.
Eventually it would also be nice if one could import/export routes in between MDT and your website. It could even ignore the custom functionality, and only import/export the information about which mobs should be killed. In general, I think MDT and your website could complement each other really well, so may be it's worth contacting Nnogga and discussing any possibilities to collaborate on your projects, so that you can share some of the more tedius/factual parts of the work (such as trash mob positions and percentages).
That would be a good next step, indeed.