Hello. I would like to know how to better promote my real estate business in Malaysia through content - photos, videos. And can one person do this?

Not enough information. Tell us more, please. Otherwise your post is too much like "Hi, how can I make some quick money?" In short, a fishing expedition.

Also, to me your heading is somewhat misleading. What exactly do you mean by What Content Is relevant?

What we are madly curious about is like - Who are you? An expat or Malaysian? If the former, what is your visa status? What sort of real estate business are you operating? And where are you? In Penang, maybe you can do well. In Gopeng, huh. In Papan, how much do you want for one of those ruins on the main street?? I'm madly keen to buy...

Seriously, and basically, in business you want the best advice you pay for and can afford. Find a good reputable media marketer or a small advertising agency and talk to them. Sure, you will have to pay, but they know their markets best.