I have free electric which units would you advise

Hi my names eddy from London
I’ve been watching you for a while now got me hooked
Basically I bought 5 s9 about a year ago but never really started was in and out lost money basically
But now I’ve started them up and I’m up and running from last week
I want to know I have free electric what is the best units to buy
I have free electric just

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^bump - I also get free electricity and have 10 ASICS