It's no longer as cut and dry as a few years ago tbh. What's for sure is GFriend has left the top 5.
Blackpink, Twice, IZ*ONE, Red Velvet, Mamamoo are the most obvious answers.
BUT IZ*ONE disbands in April, which leaves a 5th spot quite open- sure to be hotly contested between (G)I-dle and Itzy. Both are pretty neck and neck although ITZY is slightly ahead but IDLE always catches up and then ITZY has to do better and back and forth they go.
Then there's Oh My Girl. If we talk domestically alone, they're top 5 right now- might even be top 3. Their digitals are on par with the best groups, all members have solo activities, chart high on brand reputation. But their fandom is smaller and internationally they are much further behind, although in Korea they're definitely bigger than IDLE and ITZY.
There's a lot of competition atm lol.