Take a look at this zoomed out screenshot:

It's heavier than any other icon in the toolbar.
I'd also add that IMO it's kinda edgy (not rounded enough). That also stands out a bit.
What do you think about a little bit different shape?

Interesting direction. I think it's too small (comparing to other icons), but after you'd make it bigger it would be heavy again. Can we use a thinner style for it?
It's tricky to show the quote (as you said if I'm making it bigger it's getting bold), but this is something that looks much better than the current icon. Or we are trying with another shape of a quote?




I'm for "big bold version" and you?
I prefered the first proposal.
I like the "big bold version" proposal :) Although thin version is okay too. I don't like current icon either. It is quite heavy.
Next proposals after call. It's worth noting that there is a small disparity between list icon (number "2" is outside grid).




I would go with 4th option.
Some more ideas (the original is the first one):

Two more:

Slightly more refined:

I liked the idea of "hollow icon" at first sight, but it looks a bit like two six numbers: 66. Someone might think this is something connected with inserting numbers or something. I think that idea fits the theme most and is best-looking, but a bit confusing :(.
I do my best to lose this "6" feel. We can either go with a solid icon (first approach) and make it lighter by reducing the size or try to play with hollow ones. Two more:

I think the first one looks more like a quote than "6".
Shorter "tail" (as in first example) helps for sure.
TBH, none of the proposals convince me :D Damian's went into too "droplet" shapes. Olek's 6-ish into "66". So far, I'm starting to like the current icon more and more with time and the only one I also liked was the smaller version of the original one:

Olek – is it possible to stretch this one a bit? I think that something with little radius, filled "head" and slightly longer tail might work. This will differentiate it well from "66" while keeping the right size. And to prevent it from being too heavy, the head should stay proportionally small which means that the tail must become a little longer so the overall size isn't too small... I wish I could into SVG.
After 3 more minutes of looking at this, we both (I and Maja) came to the same conclusion that from all the proposed icons we like the smaller version of the original icon the most. However, there may be still options to improve it:



I think there's too much tail in Damian's mockups. So I re-adjusted my first mockup

Some more adjustments.
Before:


After:


TBH, I can't get anything better than this

in this concept. We can either merge it or try another approach.
For sure it looks better than the old version. Since a lot of variations has been proposed here I think that we can settle on something final. The last one and the one where I added a thumbs-up are looking good.
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TBH, I can't get anything better than this

in this concept. We can either merge it or try another approach.