https://smile.amazon.com/Secopad-Non-Slip-Stickers-Bathroom-Adhesive/dp/B07H9C8S81/ref=mp_s_a_1_8?dchild=1&keywords=bathtub+grips&qid=1624392833&sprefix=bathtub+g&sr=8-8
https://smile.amazon.com/SlipX-Solutions-Adhesive-Non-Slip-Traction/dp/B01NCYSH18/ref=mp_s_a_1_6?dchild=1&keywords=bathtub+grips&qid=1624392833&sprefix=bathtub+g&sr=8-6
https://smile.amazon.com/Gorilla-Grip-Original-Patented-Washable/dp/B01F5K9YNS/ref=mp_s_a_1_3?dchild=1&keywords=bathtub+grips&qid=1624392833&sprefix=bathtub+g&sr=8-3
Here's my PSA: falling in the bathtub sucks, and things are made that are designed to mitigate that risk to some extent. Get some.