Hi @Michael,
I'm requesting that you add 「だけでなく」as grammar point since I noticed it's not in the grammar section. It is similar to 「ばかりか」. It's N3 level grammar.
Thanks!
Reference:
https://nihongokyoshi-net.com/...
https://mainichi-nonbiri.com/g...
In the future, please use the official form (which appears in the grammar dictionary at the bottom after you search for something).
I'll add this to the to-do list, but we typically only add grammar entries once or twice a year, in a batch.