Well, this is extremely interesting! Thank you all for your responses!
First off, apologies if I didn't express myself clearly. And, because it seems as if I need to calm a few worries:
1. I am not getting rid of blue or shunning blue; blue will always be my core neutral and colour. My wardrobe will always feature blue.
2. I'm not looking to add earth tones or any other colours that don't suit me. Chief among those tones are oranges and all yellows, including citron. I can wear it in a pattern and possibly in a bag or shoes or belt -- but not otherwise. Nowhere near my face. So I'm unlikely to add it except as an accessory complement, however great it looks with blue. And it likely won't be my first choice to add, since it is not particularly versatile for me, unlike, say, red.
3. I'm not really looking for suggestions of which colours to add -- I know that my complementary and accent colours are reds, berries and deep cool pinks including fuchsia, and purples/lilacs/plums. There are other colours that look good on me (some greens, teal) but I'm not interested in adding those just now.
4. I don't share some forum members' negative associations to berries/ plums/ purples/ lilac. I like those colours! Yes, they can look prim or overly prissy or dated (at times) but they can also look dramatic and rich. The way I see it, any colour can look current or dated; staid or stylish -- It's all down to the details of the items and how you wear them, as well as to personal flattery.
5. Lyn Slater has amazing style but is so not me. Having said that, she's currently on a pink kick -- so maybe I can learn something from her.
Phew! Thanks for letting me get that off my chest.
Now, onto particulars.
JAileen -- rest easy. See above.
Anon -- I don't know if the opinion is general or typical of the forum or more widely shared. I don't share it.
LaPed, I think my lower contrast colouring means it's harder for me to wear HOT pink and citron. I do like vibrant pinks but they should be cool. Even my little pink bag is too "warm" (and it's fairly true).
Thank you for this -- exactly what I needed to hear and very good advice:
If I were going about this myself, my first inclination would be to examine my existing complements and figure out if there are any holes. Would I wear my lilac bag more if I had more accessories or prints that feature lilac? Do I need burgundy shoes for summer if I want to use my burgundy bag year-round? Etc.
Aquamarine, thanks.
Janet, yes, I know I could add some more cognac accessories -- I do like that as a complement in summer.
Lisa, thanks. I may add more cognac over the summer. I do like it. I actually have a lot of variation in silhouette -- that's where I've focused my attention over the past years.
Nemosmom, thanks! And green looks wonderful on you.
kkards, wise advice, move slowly, don't push it....
The Cat -- good strategy. Non-neutral bottom plus accessory (scarf). Or another way might be top and shoes. Got it. I'll bet you look beautiful in your combinations -- very cohesive.
Fashintern -- that is a big berry collection! Lots of options. It's good to know there will be something at retail. I will definitely check COS.
Jussie, you, too, look amazing in blue! And yes, I love charcoal and wear it. I am not in need of more neutrals. Pinks can work but pale tints are difficult for me -- wash me out a bit.
Jenni -- I think blue will always be around, at least in denim. It's true it might get harder to find other items, though.
Jessikams, I was hoping someone would get the reference to the song!
Opaline, thanks.
Rachy, you're right -- it's not long.
Cee-- cue up the stereo!
Gigi -- this is super helpful: For me, I have found that when I build complements, the recipe that works best is to have one bag, one pair of shoes, one main clothing item (top or bottom), and one or two other accessories (scarves, belts, etc.). I think this is one reason my burgundy complement gets a lot of wear. I have jeans, a top, a sweater, a scarf, a bag. And used to have shoes.
Taylor, thank you! Those other neutrals don't work for me, no -- I wear blue, grey, and white with a sprinkling of black as my neutrals.
Joy, thanks for enabling.
Carla -- thank you!