45% BMI need advice

Need advice. 36F, have had gastric roux en -y (2021), also had full knee replacement on both knees (due to wear and tear and snowboarding) also former power lifter. Furthermore, i had a pulmonary embolism in 2021 which sped me up on the waiting list to get the roux-en-y quicker here in scandinavia...
However, after the recent medical conditions, i have been dreading going to the gym. I really cannot fathom going there anymore. Maybe its a mindset or image issue, or just the drudgery of getting there and doing 90 mins of cardio... I have a very busy schedule, literally no time whatsoever, (i know not an excuse but I just dont have 2 hours including commute to kill for this)...

I dont eat any processed foods, but mostly greek salats, steak, ground beef, feta and other cheeses, sometimes some danish rye bread but trying to eliminate carbs as a whole and go full keto. I really need to get down to about 15% or so IMHO.