Thanks for your feedback! Then I’m going to keep it that way 
Added:
How to make postcards with perforated borders?
Author’s lottery or greetings from the meeting forum
[LOTTERY] My photo postcards arrived!
[LOTTERIE] Meine eigenen Fotopostkarten sind angekommen!
Two cards of my paintings
Added
Cards of my aquarelle paintings
Offer: 3/21 Taiwan meetup card: Benedict Cumberbatch
[Offer] Apr.10 Chongqing Meetup Cards
SWAP lots of Meetup postcards from Hefei,China
Added
Lottery: meetup card online meetup 3 April 2021
24/F/Sweden/NL –> looking for creative, bookish penpals!
OFFER: online Easter meetup 3 April 2021
Added
Handmade LGBTQ+ related: Here you send cards that you made yourself, that are in any way LGBTQ+ related: LGBTQ+ RR 
Show your pride! Be an ally!
Mailart project - emotional vulnerability
Cats for trade!
Three cat cards free for trade
I’ll definitely check them out
Added
Do your handmade cards also get more often lost on the way?
Jurassic Mile Meet-up card giveaway
In the German language category: [LOTTERIE] Handmade
Postcard made from Red Envelope
Added
Is it considered as a postcard?
Post card artists
Handmade Stickers
30/F/USA creative pen pal wanted
[OFFER] floral; bird stamp collage cards
Swap, two aquarelle/quote cards
For Swap：Postcrossing Meet-Up Cards from China
Offer: Meetingcards for swap
[Swap] Foshan meet up postcards in May & June
Added:
Crafting supplies USA
Custom ink stamps
Deciding on handmade postcard size
Handmade cards using old cards. Is it ok?
Have you ever made custom stamps?
Interesting Needlework Postcard Challenge
Mailart from the past; some examples
My embroidered papercard (tuto)
Panel Canvas Postcards
Please give your thoughts on my homemade cards
Questions about Food Packaging cards
Stationery paper and postcards for download and printout
Will the joke/pun be understood outside the US
[OFFER] Handmade cards
Offer language card
The little prince postcard by myself
Added:
My Handmade Hedgehog Carved Stamp Card and 3 Washi Tape Samples - lottery
Offer: Decorated Pantone cards
[offer] maxicard happy birthday postcard
OFFER : My Handmade Cards Made with My Carved Hedgehog Stamps
Offer&Request year of tiger maxicard
OFFER (Updated Jan. 31st 2022): Hand-colored Postcards from Millie Marotta’s Animal Kingdom Book
Ramdom handmade swap (one time only)
For Swap: Meetup Postcards inventory from China
Offer: Beijing meetup cards: Universal Resorts
[offer]meeting cards
[Offer]Meeting up cards for swap
Offer meetup cards: Beijing meetup cards
[Offer] Meetup cards, Blue Cat China collection
[OFFER]Postcrossing meet up postcards from Shanghai
[Offer] Signed UK Meetup Postcards for Swap
[OFFER]Some meet up postcards
OFFER:Tiger 2022 Shanghai meetup card with tiger stamps
Provide Taiwan Year of the Tiger meeting Card˙
SWAP lots of Meetup postcards from Hefei,China
Added:
Do you like decorated postcards?
What is “a real postcard”?
Why do so many people hate selfmade cards?
German category: ISdI - Ich Stempel, du Idee: [RR] Kreativ - RR
Round Robins that explicitly allow handmade cards or mail art
Goody Two Shoes 
Chaotic Nonsense RR
[Handmade card swap]
[Offer] Postcards about Handcrafts
[Offer]”Toilet” handmade postcard[request] postcard from Africa, Oceania, middle East, and South America
A different kind of postcard swap
[Offer]Lord of Rings, Hobbit, customized handmade cards[Request]Sandman,Friday the 13th
@itamerentytar has proposed a wishlist tag for decorations on the back in Tags Discussions + Proposing new Tags. Voice your opinion if you are interested or would like to adjust the rules of the tag.