Hi brother, thank you! I’m glad to know you did that too.
If it’s only that amount, I mean 10-20$ difference, you should not have problem at all!
If you increase the price a lot than I’m afraid my opinion about that will be not what everyone here want to hear but I think you need to check with those old clients that you know they don’t have much to pay as some new business owners, new musicians or starting bloggers then see if you will be able to pay the new price, if not you can have an arrangement with them for a long term deal.
I wish you all the best wish everything also many success.