Research ABG soil recipes. You may have to go online for a few ingredients. Tree fern bark is the most critical. It holds the soil together and provides drainage. It’s also the most difficult to find. I used to know a website that did custom soils for orchids and stuff like that. You could order whatever you wanted and they would mix it for you. It was a lot cheaper than some of the stores selling ABG online. Be careful, ABG without tree fern is not ABG.