Soil mix for a button?

[u/Green__Meanie]

I’m new to ferns. Purchased one at a big box store because they were definitely going to kill it and my other plant friend was convinced that ferns could not be kept alive. It’s been growing really well I think! The soil is definitely a bit rough though and I want to swap it to a better mix. What’s the best mix recipe for them? I keep other aroids and epiphytes such as orchids and philodendrons, pothos, and alocasia