Those L3+'s will produce more value per day than the S9's. At least they have been since they came out. One L3+ will produce the USD equivalent of about 3x S9's per day. This ratio fluctuates somewhat everyday and that level of profitability may not exist forever. But you should take advantage of it while it does.
So I would do what Mr. Phil suggested, just above me. Mine LTC or Digibyte or whatever is the most profitable Scrypt coin with those L3's.
Then convert whatever you are mining into btc on one of the exchanges.
Take a look at
https://whattomine.com/asic to help you decide the best coins to mine. Select only Scrypt. Turn off SHA256 and the other algorithms.
Or - the most simple option is to point your miners to
Nicehash. They will mine the more profitable coins for you and then pay you in btc.
Go to
https://new.nicehash.com/asic-mining to figure out the closest servers to you.
I have 2x L3+'s and they mine on Nicehash almost exclusively. Especially, when I don't have time to keep up with what scrypt coin is the most profitable every day.