Thanks you both for your comments! I'm not sure what version is best. Perhaps someone else can comment. Then I'll make the correction.
SimVenus Arts
2022-08-18 13:55:31 +0000 UTC
Alternatively, if you moved the word "Fast" between "I'm" and "getting", you would have grammatically correct English, a smaller change, and not lose or change the meaning of the sentence.
Result:
"It looks like I'm fast getting used to not worrying about anything :)"