This is a limitation of Instagram's own API, not of Ads Editor. Meta only provides daily profile insights (reach, visits, followers) for the last 90 days. If you select a date range that is older or longer than that, the report shows a notice that insights data is limited to the last 90 days and adjusts the range automatically. Paid ad data (Meta Ads) does not have this 90-day restriction and follows the period you choose. Support can't unlock older Instagram history, because Meta doesn't provide that data.