This is a brain dump of the collab pages I use / have used and generally who accept collaborations on Instagram.
I can’t guarantee they’ll accept of course! Wisdom is usually pages 5 - 10 times your follower count should be what you’re aiming to send collabs to.
Also a lot of these pages have backup pages and smaller affiliate pages - keelingram is one of those, they have 5-10 pages and backups of various sizes. Don’t be surprised if the main page doesn’t accept but one of the smaller ones may.
Again I can’t guarantee it! Make sure too your content fits their page, if it’s a bums only page no point sending a portrait.
And finally use all 5!! No reason not to and you have extra chances of them picking you up!
Any questions lemme know (and apologies for any duplications)