Expanding Data Recommendation

1.) Handle messaging app: to handle the constant traffic of messaging what server (drag and drop) application would you recommend connecting to my app who is built in adalo?

2.) To handle multiple directories in side the same app would you recommend keeping the directories inside adalo database or sending the databases to a third external application?

3.) As the traffic grows and the database/messaging grows daily what would be your best recommendation (drag/drop) application that could handle all this traffic without slowing the app down?