Well the infrastructure is getting better on the one hand, but the main reason that people lost interest. Once the price crashed from $20K to $9K, a lot of people lost interest, cut their losses and sold off their coins, so there are fewer transactions right now. Let's see what will happen once the price starts rising again and reaches, say, the $15K level.
900 is really low, I was checking it two days ago and it was 6000. Still, I am afraid that your diagnosis (lost interest) is true and I can only hope that the cure didn't kill the patient. I hope, that is, that the interest is not lost permanently because people had been dissapointed in Bitcoin.
I do not think it can be only that. When we had 300000 transactions a few weeks before and now we have 900, that means a reduction of 99.7%. Such a decrease of interest in bitcoin would have a really heavy hit on bitcoin price. Something like a down of over 95%. And as we don't see that, there must be another explanation. Maybe the volume we saw weeks ago was artificial, and what we see now is the normal amount of transactions. I can imagen we had a massive transaction spam wave in the past, that has stopped now!