Hey Jacon!
Theres really only three ways total to make money efficiently!
I'll start off with the least effective by far probably the most time consuming which is a cactus farm, however cactus farms are almost completely considered early game and are far more common then! Also the effort to reward ratio is not really there right now.
Next up we have the best long term goal of making money which is similar to most of the server... Iron Golem Farms. IG farms are the most prominent way to make money over the longterm but making ones that are efficient enough can be a little tricky though generally less so then in Skyblock or Islands as it is more about spawner spread and hopper placement. Due to the fact poppies don't drop very few 'sorting farms' exist on survival which also eliminates the need to include Redstone in iron golem farm builds. The final method of making money on survival is simple and pretty much server wide pending on where a Realm is at with its season. Sell your cubits, cubits are currently 2million per 0.01 and will probably rise again soon I would expect. Cubits are the easiest way to get a fast start money wise in Survival. A couple of unmentioned ways to make money are, Owning a shop, building houses/ farms, 'slaving' for richer players and selling Custom Enchant books. All these are also notable but nowhere near as effective.
Hope this wasn't a too lengthy answer!
- Raptor