BTW, keeping looking for fertilizers.

Check agricultural outlets, resources, friends etc

It can be very cghallenging in some locations, islands, 3rd world countries etc.....
Many in the USA take what they have for granted and assume others have all these services and products easily available.

In the past, many plant related products where not...many old Plant keeps often knew the problem all too well.

So they adapted to what we had locally and could hunt down.

I am from that group of folks.
If it's not available, I'll make it myself.

Which is why I have a lot of experience with many products and items in this hobby

Regards,
Tom Barr