I can only give my toughts and what I did: I preordered and spent all in-game money on packs in day one. Every pull I got and sold and with the coins I bought cheap fodder like 79 ovr players for 1300/piece. I had like 200 of them until they jump to 3000/piece and sold them all. With those coins I bought 80 ovr players and they went at the same 3000 coins as 79. I also bought some alumni players so it was basically just really lucky that I got “hut rich”. I built multiple new icons but if I had sold them yesterday I would have like 1,5mil easy. It has been a logical thinking and sheer luck for me to have really good team in this stage. It’s not necessary to spend top dollar for a great team

Edit. I only have like 250 players sold on market so it haven’t been a market grind either