Total sidenote, now that I'm a regular at r/ArenaHS, hearthpwn's forum on Arena really declined in activity.
But yeah uh, the most consistent Arena streamers right now are Dreads and BoozorTV (a mod on this very webite!). Both of them streams on a daily basis and have multiple top leaderboard finishers. ShadyBunny and Collins is playing a lot of Autochess right now so you're not seeing them play Arena that often.
Strongly recommend watching Grinning Goat and their Lightforge podcast - the break down of every new meta at the first month of the expansion is invaluable.
PS: shameless plug, I'm also streaming Arena this month at least 2 runs a day tryharding to make the Leaderboard. I've made it about 13 times in a row now but this is the first month I'll be streaming regularly for 2 runs a day (on weekdays except Friday) to get this tryharding done.