Even if you don't trust this chart, some ideas can be drawn from Bitcoin's monthly chart
Some defend the theory of Bitcoin cycles, according to halving, and you can compare the months of this cycle to find some pattern
Just as some months may reflect better investment periods according to tax payments, payment releases, etc., especially from important countries such as the United States
Yeah, that's why I wouldn't completely discard it, but I wouldn't be putting too much weight on it either.
If you look at the median values, apart from maybe October, all values are rather modest and do not show any massive swings.
It could also give a bit distorted look, e.g. a +0.01% gain would make a month green, while -0.01% would make it red, despite the result being essentially the same with a very negligible difference. But visually it might look like there's a trend for certain months.