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Grayson Waller has been active in WWE for more than 4 years, and he is one of the most prolific youngsters of the promotion right now. He started his WWE career in the NXT, which is the developmental territory of the promotion. He spent a couple of years in the NXT before making his main roster debut, and he had been quite impressive despite failing to win any titles in the NXT.
Grayson Waller made his main roster debut in 2023, but could not get into in ring action as soon as he made his main roster debut since he was injured at that time. Once he was clean to compete in the ring, he started teaming up with former WWE United States Champion Austin Theory, and together they formed a tag team named A-Town Down Under.

Grayson Waller discussed the misunderstandings about his backstage repetition
This tag team became quite successful during the early days, as they even captured the WWE Tag Team titles at WrestleMania XL upon the split of the Undisputed Tag Team titles. But things started to go down for them despite winning the titles, and after Austin Theory suffered an injury, Grayson Waller started working alone.
Grayson Waller has been active on the main roster since 2023
It does not look like WWE has any big plan for Waller anymore, as he has been stuck in the lower mid card for quite a long time. Recently Australian professional wrestler talked about his backstage reputation and discussed the misunderstandings about his character. Speaking with Chris Van Vliet on the "Insight" Podcast, he explained the following;

He is presently working on Monday Night RAW
"There's certain guys you can't do that with because sometimes people buy into the hype or they don't know what this is, but obviously Cody being second generation and having his brother being a wrestler, like he gets what this is. We can have some fun. We don't have to plan that. We can go out, I can be super disrespectful and he's not going to pull me backstage and go 'What are you doing?'
"Like he's going to understand, okay, you were just trying to get a rise out of me. And sometimes that will actually bring out energy in him ... there's certain guys that you can't do that with because they don't understand what this is and they have too much pride." Said former WWE Tag Team Champion.
h/t to Wrestling Inc. for the transcription