So I have a few ideas about the wide-ranging and meandering topics here.
Sorry, this is a bit long so I’ve broken this down into sections.
I’m new here, so a bit about me:
About a year ago I retired and decided, "I’ve gotten good at photo manipulation in GiMP, vectors in InkScape… and now that I have the time I’d like to learn how to draw/paint freehand. I could barely draw a straight line at the time, and I’m only slightly better at it now. 
When I started to think about doing digital painting I looked at several program options. I looked at the features of each program. But more importantly, I looked for finished works that had me feeling, “I’d love to be able to do that someday!” Honestly, I found it hard to find finished works that said they came from Krita. I was able to find enough to see what was possible. At the end of the day, I took a leap based on feature reviews and I’m glad I did.
Advertising, i.e. bringing in more users:
https://www.youtube.com/@JamesJulier-Artist
Over this past year or so while I was learning to draw/paint, I’ve been watching “James Julier Art Tutorials” on YouTube. He does weekly under-an-hourish-long videos where his tagline is “I’m going to break this complex looking [painting of the week] down into steps that are way easier than you imagine so you can have a go at painting this.”
He uses Procreate, and honestly, if I had an iDevice I’d really think of picking it up based on his videos alone. His videos are not just time-lapses, he shows exactly what he’s doing from colors to brush selection to brush stroke to brush size & opacity to layers to filters & blurs to deforming tools… you get the idea. It’s a tutorial on how to use Procreate one cool painting at a time. Every week. My Monolith and Egg submissions to this month’s Challenge are rooted in methods he shows how to do in two of his videos. Of course, I have to translate everything into Krita terms… and…
If the Krita community had people doing this type of teaching video for Krita, I bet more people would pick Krita up and play with it. I only wish I were good enough in Krita to pick up the gauntlet and make videos like this. Maybe in a few years…
Voting icon:
Icon: Does the forum software have the ability to add icons? If so, how about something like this:

A quick search over at my favorite icon place (throphy Icon - Free PNG & SVG 4145762 - Noun Project) came up with a laurel wreath, you know, the thing often associated with winning a competition. I’m sure a community of arts could come up with something cooler than this example. Even if someone just thinks the icon is cute, choosing that icon over a star or a heart would still likely indicate a work that should be considered for a feature spot. The tool text could be “Nominate me” or something along those lines.
Nominating process:
A threshold of counting wreaths/likes seems like a good idea to nominate, and I’d like to question the time-bound aspect. If an image gets N (number of) “likes”, it should get nominated, even if it takes months to reach that threshold. I’m sure most “likes” happen rather quickly. However, let’s say someone is browsing history or a scrapbook. They like an image and that action pushes it over the N limit. This should get nominated to be featured. Of course, once the N limit is reached it can not be nominated more than once.
Also, it would be best if IMAGES rather than entire comments could be nominated. Sometimes there are multiple images in a single comment, or people may be liking the comment with no thought of the image. I’m wondering if liking just the image is an out-of-the-box capability of the discussion board software…
Website Design:
I gather the discussion board here is limited in how it can be customized. A few other sites have been called out and I use https://www.deviantart.com/falconet9 as my online scrapbook. I like the way the gallery is laid out there and the way suggested/featured images are handled as a sidebar.
Oh, and I’m almost exclusively a PC user. The only time I go there on my phone is to pull things up to show images to friends when out and about. I have no idea how favorites are handled there and the volume there is huge so I rarely get more than a handful of likes.
In closing:
Ok. If you’re not asleep, thanks for reading this all the way through. You’re cool. 
Thanks to everyone for making krita-artists.org a cool place to come and play! I’m so happy to have found this website and to get to play in Krita with y’all!