TheGiddyStitcher started a list of crafting communities:

CROCHET

!crochet@lemmy.ca
!crochet@kbin.social

CROSS STITCH

!lemmy_stitch@sh.itjust.works (also welcomes embroidery posts)
!crossstitch@kbin.social 

DICEMAKING

!clacksmith@lemmy.world

LEATHERCRAFT

!leathercraft@lemmy.ca 

KNITTING

!knitting@lemmy.world 
!knitting@kbin.social 

SEWING

!sewing@lemmy.world 
!sewingrepairing@sh.itjust.works (reduce waste through sewing)
!sewing@sh.itjust.works 

SOAPMAKING

!soapmaking@lemmy.ca 

TATTING

!tatting@sopuli.xyz 

MISC

!Lace@kbin.social (a celebration of lace, in any craft)
!crafting_fails@lemmy.world 
!creative@beehaw.org (general arts & crafts, may not be accessible to many users)

Additionally in German: !handarbeiten@discuss.tchncs.de Handarbeiten fein und grob, which is open for all crafts