Quick check in/update. Started January last year at 109 kgs. Had a goal in mind - more size than weight. Reached that comfortably - size 32 Levi jeans (no stretch!) for the Guns n Roses concert. Weight was around 77 - 78 kgs. But from then on it was year end events, bike rally, quiet office (lame excuse) and Christmas/New Year. Weighed in on Monday at 88 kg. Loss for the year was 21 kgs, aiming to get to between 70 and 75 kgs. Need to get the mental side sorted, my biggest problem I have realised.
No matter what we do with respect to diet and exercise, we are all going to have our ups and downs and plateaus to some degree or another from time to time. You already know how to lose weight, you clearly know that you can lose weight and your aim of 70 to 75kgs shows that you know you can go beyond what you have already achieved.
You are thinking of continuous improvement, lasting changes and overcoming temporary setbacks. I would say you already have the mental side sorted and are ahead of the game.