What currency is it advisable to mine? I have 9 1060 3gb that Ethereum can no longer mine
I would advise you to sell all 3 gb cards, add a little extra and buy used 1060/6 or 1070 (better).
Used gpu is very cheap these days, and in the future (maybe half a year or 1 year) 3 gb cards will be useless anyway.
So, better sell now, when they still have some demand.
why is that? You could still mine any equihash coin, including BEAM. and you can mine pretty much any other algo today except grin..