I would suggest some more are which could help.
One is to make a websocket based subscription service. it is 1000 times more effective than the api calls. I didn't find any similar service. If we process block information by our own, it is more effective. Especially in actor based development model.
The second objective could be use other services than aws. Multicloud providers makes the service more independent. I would also suggest physical host instead vm's. We will see. I will work on the first topic because it needed for my other developments. If it ready, it will be publicly available.