I found a similar question on this site, but the answers to it did not fix my issue. I bought iFixit’s Joy-Con repair kit and installed my new control stick part directly from its sealed bag. My control drifting persisted on the device. I updated the controllers per the first answer to the similar question and re-opened my device and reinstalled the control stick ensuring that its ribbon had no debris. This did not resolve my issue and the drift effect on my controller persists.