It’s the rooting hormone. Don’t know why people keep using it. It always causes issues.
2nd issue is the heat mat. Also almost always the issue. The two combined cause the most failures in rooting, no guesswork needed.
3rd most common issue is lack of air in the rooting mix. Weighing and measuring water is completely unnecessary and only becomes an issue when people do not use a balanced mix. I think it makes people feel “professional” to measure the “proper dose” of water each time, haha, that’s the only explanation for why it persists. Just balance your mix better and the need for that goes away.
I would focus on materials you have readily available in your area. I’m sure there are things that will work there just as well as the typical things used here. What are some of the base materials there? You need something to hold water and something to provide air pockets.
Sorry for the losses though, that stinks.