IoT being a buzz word in the industry as well as among the students, lots of people are looking for career in IoT. I suggest not to get into the the fields where there is saturation / already many are there.
There are still many career options available in IoT fields which are not explored. Kindly check for those options
As IoT Architecture is very complex and there are lot of domains where you can start and check for career development.
Kindly do some research work before choosing the path .
Here is the link you can first refer to:Introduction to Internet of Things | IoT Tutorial for ... - Edureka
I suggest you to understand IoT on broad level first so that you will be able to make out which domain and technically/ management wise which area to select.
There are some tools also to find out niche career options in the field.
You can also refer to edureka lifetime access course of IOT: here: IOT Course | IOT Training & Certification - Edureka
Thanks & Regards