As I said, this is where I’d start.
I’d also make sure that all my Wemos tests were done with nothing attached to the board other than a USB serial/power connection to a computer with a USB port that is known to be good.
I have a similar setup with a Nextion display controlling multiple devices and showing data from multiple sensors (about 20 devices in total at the moment). Running Blynk Bridge code with this setup would be a nightmare, so I use MQTT messaging to communicate between devices, and Node-Red running on a Pi with Blynk, Alexa and IKEA Tradfri plug-ins for Node-Red. It works very well.