Excuse me, what is this text? Tibetan?

Unprofessional, nonsense, just for entertainment ...

That's not Tibetan, but some kind of Sanskrit writing. By the way, explain the direction of the text. The six characters in the outer circle are centered on the center of the circle. This picture is the six-character mantra of Buddhism. You know there is no binding relationship between language and words. A script can be used in many different languages, and a language may be written in many completely different languages. Early Sanskrit was not written, but oral. Now Sanskrit seems to be mainly written in natural style, but after I checked it, I think it is very unprofessional. There is a big gap between natural style and this font. I don't know if it is. But from 600 to 1200, Sanskrit was written in Siddhartha's handwriting, which is no longer used in modern times. However, with the spread of Buddhism in ancient times, for example, Master Xuanzang learned from the West and brought back many Buddhist classics, many of which were written in Siddhartha script, so India did not use it, but countries like China and Japan still kept Siddhartha script, which may be a bit like this. . .

Supplementary answer: I have confirmed that this is Siddhartha Tan Wen. It can also be written in Tibetan. You can see it in the entry of "six-character mantra" in Baidu Encyclopedia.