Well, I can't calculate your ROI correctly because you did not mention how much you spent to build your mining rigs.
If just calculate L3+ and PSU it will be = $33,535
Based on nicehash calculator, 1 antminer L3+ could produce $650/month. As you have 19 L3+ = $12,350/months
You may achieve ROI within 3 months, am I wrong?
Since I still have plenty of electrical overhead and the miners are running at good temps and in a well managed condition, I may offer hosting to a couple of people for a couple machines at a very competitive rate and see how it goes, then offer a more legitimate hosting solution when I scale up in the future.
One last question; where do you live? as you may hosting for a couple machines, maybe some people who stay in the same city probably want to contact you. Thanks.