Am I correct in thinking you were diagnosed with T1 some 4 years ago?
It takes time for your immune system to kill off most of your insulin producing cells. So it's very normal to see an increase in your dose over time for years.
I'm almost 7 years in and my dose seems to have more or less settled during the past year and a half or so, sometimes I need a little more, sometimes a little less. But before, it was a slow and steady increase over the years.