Some months ago i have entered Qatar's Covid promo, where you were cancelling and receiving paid price + 10 % as a credit, to be used on the following 2 years.
I did it to extend last Covid19 Thai visa, and worked great.
Regarding being Malaysian and land boarding was already cleared. Read above. Rest - I'm referring not to neighbouring countries, so easy to understand..- can enter through land boards, two times per year.
About 180 days per year, if you re read you will find what I've written, that I was based on information spreaded over the internet groups/forums.
The one I have posted is what use to be a reliable group called thaivisa.com that then turned to be named ASEAN now.