Do you want to Join or Union them? Are the schemas the same? If you're wanting to Union with the same schemas, you can use a wildcard in the Input Tool. For what I have below, it'll import all files in that folder that are xlsx and have the same tab name (tab name not shown in the picture).  
Edit: This flowchart might help. It talks about the different ways to import multiple files with minimal tools - https://knowledge.alteryx.com/index/s/article/The-Ultimate-Input-Data-Flowchart-1583459854309
