Problem with high CPU from repetitive activity

There is excessive cpu coming on 1 link only on my website:

beatayogadhyan.com/wp-json/tdw/save_css

all requests making that high cpu are repetitive like this :

80.82.76.214 beatayogadhyan.com - [29/Nov/2023:12:15:36 +0000] "POST /wp-json/tdw/save_css HTTP/1.1" 429 593 "-" "Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36" | - | - - 0.002 - 0 NC:000000 UP:-DT

What can I do to stop this request?