As someone who will buy any app that seems like it will have even a 20% chance to be useful to me, and purchase it without hesitation, I'd just like to say here that I've bought many $10 apps that I saw used in YouTube tutorials or that seemed to have promise for what I do, but I would never even touch an app that charged a penny a year by subscription.
I think if you have to raise prices it's something people will adapt to, just please don't change to subscriptions. In this world where the average 12 year old is walking around with a $400+ phone and the average 16 year old doesn't hesitate to buy a $5 coffee with whipped cream and sprinkles, $2 for an app won't slow them down as much as people think, as long as it's not a subscription.
If you need to change your prices, I don't think people will hesitate to spend as long as it has good reviews (promise), no ads (no lasting regret or annoyances), and a one time purchase price.