Sheet Pan Salmon and Avocado Fajitas

lbs salmon (, skin on)

McCormick Fajitas Seasoning Mix, divided

each red (, yellow and green bell pepper, cored and sliced into strips)

medium yellow onion (, peeled and sliced)

olive oil (, divided)

lime ((about 1 1/2 Tbsp juice))

Salt

chopped fresh cilantro

medium avocados (, sliced)

corn or flour tortillas (, warmed)

crumbled Cotija cheese

Sour cream and Mexican hot sauce (, for serving (optional))