Will it be okay to get up in the morning and forget to tip in Thailand?

Tipping is voluntary, and forgetting to give it is nothing more than the dissatisfaction of the service staff.

If you leave the store that day, forget it.

I have to stay a few more days and make it up the next day.

The worst thing is that the waiter doesn't clean your room (in rare cases) and generally doesn't maliciously damage your things or anything.