@Kitty_Visser you clearly have no idea what you are doing, and the advice provided by a number of different forum members hasn’t helped point you in the right direction.
This isn’t really a reflection on you, it’s an issue with the hardware you are trying to use for your fisst project.
If you had started with different hardware - say a NodeMCU - then you would have been up and running in a very short time using the Blynk Sketch Builder and you would have found it much easier to start understanding that code and tweaking it to meet your exact needs.
With this hardware there are no ready-made sketch builder examples, and there are so many permutations of ESP firmware, serial/SoftwareSerial settings, baud rate and switch settings that it’s much more difficult to guide you through the process of getting this working.
I really would recommend you spending around $3 and ordering a NodeMCU. You’ll have that working in a few minutes of it arriving.
Take a read of this topic about my thoughts on hardware choices for beginners…
Pete.