Cloud mining on sites like hashnest (watch out for ponzis and other scam sites though).
Investments in trading bots or online casinos to get a good profit.
Also, you can lend for colateral.
From what I've been hearing, it seems like cloud mining and casual mining in general just doesn't make sense anymore and isn't profitable. Plus, as you mentioned in your reply, there are so many scams that have a facade of a cloud mining site, so OP would really need to be careful with that.
I think offering loan services on this forum would be a great way to grow whatever you currently have op. You should check out the loans and lending section here.