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I am stuck at like 120 wpm and I just can't get ahead. What do you guys  think is the next step to getting my typing speed above 120?
Hi. I currently live in a place where there is often dust in the atmosphere, and I would like to keep my keyboard clean from dust as well as from other particles. However, removing & adding back the keys every time I want to clean it, is a pain in the ass, since I have to do it pretty often. Is there any other way to achieve it? Would any air compressor work or is there something better? >

Compressed air would work
Also you could use a small towel to place over your keeb when you aren't using it >

no idea, its a thing (people being downvoted) that happens in the daily threads >

How can I re-attach the non slip foot to the bottom of my ducky one 2? One of them fell off months ago, and it's been hard times ever since. I've tried hot glue, but no luck. >

Use different glue >

That just might be crazy enough to work. >

Looks like the last community poll was done in 2017.  Are there any plans to do another? >

Probably not, they're not particularly useful. >

I want to get into building custom keyboards, but my hype has crashed pretty spectacularly lately, as any time I find any highly recommended products, they are sold out. Also, I'm afraid that when I'm done building my first keyboard, I won't really know if I've done a good job, since I have no reference point.
So now I've come to the conclusion that I would rather buy a pre-build (but "custom") keyboard that is really well put together, perfectly lubed and tuned and all that. This would give me a reference point for what a *well built* keyboard feels and sounds like, and give me a starting point for future modifications.
Are there any companies that sell *high quality* fully assembled keyboards that are fully customisable after the fact? (Most importantly hot swap switches) >

Not really. There are some pretty decent pre assembled boards out there, but will not that great stock. They're perfectly usable, but not what I would call well lubed/tuned. So they won't be great reference points as to what a well built custom really feels like.
Preassembled Keychron Q series boards are a good spot to start at. They are sort of the entry into custom cnc aluminum kits with a decent mounting system. Can be improved with a few simple mods. They are somewhat outclassed by recent kits though. Qwertykeys and Meletrix have been coming out with better boards at relatively similar price points to the Q series boards. Those aren't prebuilts though.
I've seen a few reviews about the iqunix og80 that say it's pretty out of the box. But from what I've seen it's somewhat annoying to open up and mod later on.
KBDfans offers an assembly and lube service, but I haven't personally used it or seen many reviews. >

Thanks! That's a bit discouraging. The qwertykeys board I've seen recommended is obviously out of stock. I guess I'll do some more research and perhaps buy a keychron kit, if it's in stock...
(What the heck is up with the custom keyboard industry by the way? If everything is constantly out of stock, isn't that a hint that demand is higher than supply? Just produce more! It doesn't make any sense to me.) >

it has always been this way they do produce more demand just cannot keep up with supply also many of the items in this hobby are considered niche items and manufacturers are fine with how things are . if stuff sells out the first day it restocks they r fine with it not like they r lossing money because of this . even stuff like the qwertykets line of kbs does rolling preorders with thousands each round and it sells out in the first day . they r ordering as many as they can >

I'm not even able to select out-of-stock items on qwertykeys' webstore. What am I supposed to do if I want one of their boards? Refresh several times per day for weeks or months and hope to see them in stock?
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it not like they r lossing money because of this

Pretty sure that's not how economics works. If it's not in stock, people will try to find something else, like I will. >

Refreshing their site isn’t needed, as they typically announce their Group Buy/Pre-orders via newsletters or discord. 
If you want a more ‘conventional’ supply chain, then Akko or Keychron offer quite a few keyboards that are available for retail purchase whenever you want. 
The quality of the item will still be solid; it just won’t be custom because it’s a regularly restocked item, rather than a one off run. >

Need a new keyboard.
Must be somewhat silent, have a RGB setting that makes one key glow after pressing, 87+ keys and cheap. >

You are basically asking for "something to drink" in the biggest drink bar in the world.
Most rgb keyboard have that function you are asking for.
The silent part depends on the switches and your own mods to the keyboard.
The "Cheap" is different for everyone, i consider 150$ expensive while there's people thinking 300$ is cheap af.
If you give a price range i'll give you some recommendations.