Should i sell my current property (landed property) to get equity cash out and downgrade? or should i hold on longer for higher capital gain? ?

Hmm I don't predict property cycles so maybe you should speak to a property agent about this instead.

However, the question I would pose to you is, if you were to cash out and downgrade now, what are you going to do with that cash?

Do your research and see if your property will continue grow or not. If yes, you can hold longer. If no, cash out and downgrade. Its ur own house and investment, you have to make ur own decision.