Tips on gaining weight ( type 1 )

Hey all!

I was diagnosed a little over a year ago. I went DKA and lost a ton of weight. Haven't been able to put any of it back on. And since I've cut most carbs and eat mostly protein and veg. Also, I have a job where I'm on my feet for 11-12 hours a day, so always running around. I eat at least 4 times a day, rarely skip meals at all.

Any insider advice would be great! Thanks