Hi,
The community would like to help you, but replying to a two year old thread with a long block of text isn’t a good way to ask a question. A new topic post with specific questions may get you a much better result:
https://community.home-assistant.io/t/how-to-help-us-help-you-or-how-to-ask-a-good-question/114371/3
I’ll attempt some answers as best as I can…
2023 Tasmota firmware for ESP devices can emulate switches and lights in a way that 2023 Alexa (and the Amazon cloud platform) could control.
There is also now an Alexa integration and also one for Google for HA to expose HA entities for voice control.
In 2025, I would personally use Matter/Thread devices as they can be natively (and locally) controlled by multiple local and cloud platforms (including Amazon & Google). Certification ensures devices work together.
My experience with Zigbee is full of random errors, tweaking quirk files, and incompatible firmware problems.
For more protocol comparison…
Due to Amazon’s changes to privacy conditions, all my Alexa kit has been turned off, and replaced by HA Voice Assistant PE as the device respects my privacy.