Noun + だけではなく(て) + Noun/Verb/Adjective
Verb[plain] + だけではなく(て) + Noun/Verb/Adjective
Adjective + だけではなく(て) + Noun/Verb/Adjective
The grammar structure ~だけで(は)なく(て) is used to express "not only ~ but also ~", emphasizing that something has additional qualities or aspects beyond what is initially mentioned.
だけで(は)なく(て): Either は, て, or both can be omitted forming だけでなくて, だけではなく, and だけでなく
Note that when て is omitted, grammatically a comma (、) is required after だけではなく.
だけじゃなく(て) is a more casual form.