If you look at the campaign service discussion board, there's a thread created titled Overview of Bitcointalk Signature-Ad Campaigns [Last update: 20-Aug-23] this comprises the numbers of all signature campaigns on this forum both active and non active ones, you can from the list of the ones listed active on the table which have selection of mixers among them, you can check to see a number of the mixing services available and make your choice, you can also see from some of the members wearing their signatures and avatars on the forum.