Some thoughts re weight and exercise. The TL;DR is 'eat sensibly, exercise sensibly, and don't neglect your mood and general happiness — strive for balance between these three, and then let your body take whatever shape it wants to take'.
(For reference, I was 120kg a few months ago, am 110kg as I write this, and aiming for 95-100kg, and am 6'3.) Caveat: I'm not a nutrition/exercise expert, so these are just my current thoughts, and I'd welcome corrections from those who, unlike me, are expert in such things.
I find weight maintenance comes down to a combination of diet, exercise and mood. Exercise alone isn't enough. (I would use an exercise bike at home and regularly go on 2hr bike rides, and not lose any weight, despite being 20kg or so over what I should be/would like to be -- carrying those extra 20kgs up hills on the bike is something I'd prefer not to have to do.)
The latter one, mood, is important. If your mood is low, you do less between the times when you explicitly exercise; you burn fewer calories when 'idling'. Likewise, if your mood is high, your burn more when 'idling' (perhaps too much). If you try to starve yourself thin, likely your mood will lower.
The rate at which your metabolism burns calories when you are 'doing nothing' plays a large role in whether your body stores fat or burns it.
In addition, low mood can lead to 'comfort eating', and I'm guilty of that as much as the next person. Then with diet, the thing with mood plays a role here since with low mood comes low motivation to maintain any sort of discipline, combined with the urge to comfort eat.
(Something I discovered when cutting my meal portions in half and cutting out most sugar, was that I wasn't exhausted, and could still comfortably exercise and cycle everywhere, and lost 10kg in 2-3 months, so clearly beforehand I was eating way more than I needed, whilst thinking that I was consuming enough).
In addition, if what you eat is more nutritious, then you find yourself wanting to eat between meals/snack less. If you eat junk, your body just wans more and more because it hasn't got the nutrients it wants, so thinks the solution is to eat more, rather than better.
So don't neglect your mood when it comes to weight management. And don't neglect the quality of your meals and fall into the trap of thinking it's only a matter of quantity. And don't neglect what you choose to snack on, if you must snack. For example find things that are sugar free, and snack on those first. As for sugar, prefer fruit to non-fruit.