Hello Anonymous,
"I am interested to work in that domain now" is NEVER a wise way of opting for careers.
Even though Interest plays an important role in career selection, you ALSO NEED TO COMBINE it with your capabilities/past-experience AND the effect in the long-term.
The role of Executive Assistant is not a bad one in any Organization--better stick to it. As you would be aware, Executive Assistants have exposure to a wide range of functions--including Purchase, Finance, etc--as a part of their jobs. But getting into the hardcore functional roles of any line would make your career graph 'look like' you didn't stick to any one role/function......am speaking form the Recruiter's perspective.
You surely have a very valid reason/justification to show your part-time exp ['I can concentrate on my family side, which was needed at that point of time']--leverage on it. And you can also mention that this exposure to the overall operations of an organization has given you the ability to view organizational situations/issues in a 360 deg way. At your level, this becomes a major PLUS [it may not be viewed the same way for a junior level employee]. Exposure to the operational/implementation side of decision-making for an Executive Asst is always a Plus.
Coming to your remark "Also the salary I am getting is very less when compared to my previous job", I am not sure as to how can you compare both--a part-time job salary will ALWAYS be lesser than a Full-time job.
So suggest don't focus excessively on this aspect--in your I/Vs suggest give BOTH the CTCs with clear demarcation of full-time & Part-time.
And pl be ready to be MENTALLY flexible on this aspect to begin with. Else the chances of spoiling the I/Vs will be high--the over-focus on the one factor/aspect is USUALLY @ the cost of focus on other aspects of a situation.
All the Best.
Rgds,
TS