Many thanks to your replies guy, highly appreciate your shared experiences,
Well, regarding the renewal, it's a one year multi-entries non-o, one year validity visa which will expire on the 19th of January,
I knew there is an option to extend for 60 days, then I must leave to get 90 days single entry visa, all Thai embassies in the neighborhood countries they don't provide multi-entries, ONLY one single entry of 90 days, my current one year I obtained it last year when I was in UAE,
Well, as I understood from the comments, there is no one direct train to the Thai-Malay border,
So, the trip will be from BKK - Hat-Yai, then get on the next ride to the border, and wait for the coming back shuttle,
As long as no facilities to stay one night at the border, the only option is to return on the same day, a bit worried if we could not catch a shuttle coming back from the border to Hat-Yai on the same day will turn the trip to a nightmare,
I hope there are some other options these days such as buses, vans, etc.. at least we can wrap up the round trip,
I heard about other check point borders such Cambodia, Laos, but Malaysian border is more convenient for me.
Thank you again for your helpful interaction guys,
wishing you and your beloved ones a very happy, successful and peaceful new 2024,