Also a less riskier and basically guarantee profit investment is just getting 83-84 rated players when they're cheap and sell when they're needed. Right now you can get some 84's for 2.5k, some 83's for basically discard price. If you need an 83/84 rated squad, 83's go for 3k or so and 84's can go over 6k. Even less of a risk is the 83/84 players from the premier league. Hazard potm would surely need high rated squad and premier league players. Pretty sure Kepa is one of the cheapest 83's in the prem, he's 83, plays for Chelsea. Tick off a lot of requirements right there.
Also if nothing else, you sell all these the day before the sbc is released and you'll make huge profit if you don't want to risk making the big money but also losing the guaranteed profit. The hype for these is always there and goes up a lot. Mandzukic for example I have loads of, got them at around 2k, last friday before the sbc's dropped he was almost 4k just out of a small chance of an 84 squad being needed for Lucas, and then he dropped and I got a bunch at discard price once they weren't needed.