だけでなくて～もNot only ~ but ~ also, Not just ~ but ~ also

のみならず and だけでなく(て)～も are nearly identical in meaning, both meaning 'Not only (A), but also (B)'. のみならず is by far the more formal expression, while だけでなく (especially in the alternate form だけじゃなくて) is more common in everyday speech. For example, 日本語のみならず、韓国語も話せる 'He can speak not only Japanese, but also Korean.' vs. 日本語だけじゃなくて、韓国語も話せる (Same meaning, but far more casual).

Both express that something applies to more than one item, but differ in nuance and tone. だけでなく(て)～も is a neutral 'Not only (A), but also (B)', e.g. 日本語だけでなく、韓国語も話せる 'He can speak not only Japanese, but also Korean.' はもとより is more literary and formal, and suggests the first item is obvious, e.g. 親はもとより先生にも感謝しています 'I'm grateful not only to my parents, but also to my teachers.'

だけでなく (or だけでなくて, だけじゃなくて, etc.) is a common expression that means 'not only'. It is often followed by another noun + も in the expression だけでなく(て)～も, which has the meaning of 'not only (A), but also (B)', e.g. 肉だけでなく、魚も食べる ('I eat not only meat, but also fish.'). In other words, だけでなく(て)～も is an extension of the だけでなく pattern when you want to specify the additional thing or quality.

ばかり emphasizes exclusivity, meaning 'only' or 'nothing but', e.g. 肉ばかり食べている ('He eats nothing but meat'). だけでなく～も expresses inclusion, meaning 'not only…but also', e.g. 肉だけでなく野菜も食べている ('He eats not only meat but also vegetables'). Compared to だけ, ばかり often carries a stronger nuance of excess or doing something too much.

をはじめ gives a representative example and implies that others follow, e.g. 東京をはじめ、全国でイベントが行われた ('The event was held across the country, starting with Tokyo'). だけでなく(て)～も lists multiple elements without suggesting one is more representative, e.g. 東京だけでなく大阪でも人気だ ('It's popular not only in Tokyo but also in Osaka').

ばかりでなく and だけでなく(て)～も are nearly identical in meaning, both meaning 'Not only (A), but also (B)'. ばかりでなく is the more formal expression, while だけでなく (especially in the alternate form だけじゃなくて) is more common in everyday speech. For example, 日本語ばかりでなく、韓国語も話せる 'He can speak not only Japanese, but also Korean.' vs. 日本語だけじゃなくて、韓国語も話せる (Same meaning, but more casual in tone).

Both express 'not only (A), but also (B)', but the nuance differs. はもちろん stresses (A) as obvious, e.g. 寿司はもちろん納豆も食べる ('He eats not only sushi, but also natto'). だけでなく gives equal weight to both, e.g. 映画だけでなくドラマも好きだ ('I like not only movies, but also TV dramas').