You may like to see similar questions and answers below
You are a qualified engineer, yet you are applying for sales and marketing roles. That’s like a footballer wanting to get into the Ranji team.
Please focus on your core area of expertise and look for opportunities in the engineering field. In order to do so, you may have to supplement your skills with additional certificate programmes.
With global markets opening up, do keep your options open for international roles.
A master's degree in electrical engineering could also be a good option for you.
If sales is your area of interest, then focus on engineering product/services companies to make use of your educational background.