Good luck, I've been on the same journey.   
It took some work but I am losing (albeit at a slower pace) most weeks again. 

Weirdly the exercise bike / gym claims in my Apple Watch to have burnt less calories than when I swim - but I notably do lose weight doing the gym activities and no longer do from swimming (although it still does wonders for my mental health and muscle tone). 

Years ago I lost loads of weight through walking long distances - after about a year it stopped having any impact on my weight. To this day I can walk ridiculous distances + eat well and see no real impact on scales.