Help! Gaining Weight, but not raising temperature

I’ve noticed minor improvements, but nothing extraordinary.
What I’ve been paying most attention to is body warmth which has increased overall, but this feeling is not consistent.
The biggest issue that I’ve been facing when following the general guidelines to raise metabolism is consistency. While my overall calorie intake has increased, I haven’t been fully consistent with it. Some days I will eat a lot more than others, (which is also when I tend experience greater heat production). Other days I eat less than normal (and thus feel less body warmth). But overall, I eat more than I used to. Also, my meal timings have been inconsistent and irregular. I know that in Diet Recovery 2, regular, consistent meal times are a health asset. But I eat at more irregular times with a late breakfast, or a late lunch, etc. There have been days where I’ve delayed eating a meal at its proper time – mostly due to convenience. So this is really the main thing that I have not been following. While I’ve been eating more overall, my meal timings have been inconsistent, and there have been days where I’ve alternated eating a lot with eating less – but this is mostly because I tend to eat when it’s most convenient (and when I actually have the time). And so I’m wondering if this could be stagnating my progress in increasing my metabolism. Are regular, consistent meal timings every single day, an indispensable part of raising core body temperature?

Would eating irregularly cause more of the stress hormones to stay active longer than usual ( as I’m allowing periods of slight hunger to persist longer by delaying meals), thus causing rise in body fat, especially belly fat? My ultimate goal here is to raise my core temperature, (I want the gain in body fat to be a mere ‘side effect’). Since that really is the main guideline that I have not been following, I’m just wondering it that alone could be responsible for hindering my rise in body temperature.