You're a newly diagnosed T1 so likely in the honeymoon period where your pancreas slutters out unpredictable amounts of insulin.
You're also on fixed dose of insulin and not matching your doses to the carbs you eat.
Of course your dose won't be perfect in those circumstances, how could it be?
Your graph looks pretty good really, you caught the hypo at a decent 3.9 before things get really problematic. You can treat and move on, nothing bad happened.
Apart from not matching your carbs to your insulin yet, and your unpredictable insulin production adding to the injected insulin, any of those 42 factors and the colour of your socks can affect BG and could have played a role.