Can insects evolve their basic anatomy to grow in size?

In my fantasy world, there are several species - both sapient and non-sapient. They all originally evolved from a group of insects that, after millions of years of isolation and no competition, have managed to evolve out of their anatomical constraints such as their respiratory system and exoskeleton.

Ignoring the sheer unlikelyhood of such a occurrence happening (which does have an in-universe explantation), what would these changes to the insect anatomy form and look like?

Let's assume oxygen levels stay (roughly) the same as modern day Earth without too much deviation, so no super bugs due to increased atmospheric oxygen.

EDIT Due to fact that this question is apparently a duplicate, I would like to clarify. This question is asking about land based insects and how the respiratory, visual, circulatory, skeletal etc are changed due to an increase of size after enough time to evolve.

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Can insects evolve their basic anatomy to grow in size?

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