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If you are doing either the frontend or backend work for a fullstack story, communicate early and frequently with the developer(s) who are working on the other part of the story.
If you have a PR that’s been open for a couple of days with no reviews, notify the team and get it reviewed to help the QA review your work throughout the sprint rather than at the end of the sprint.
If you find you have to do a lot of repetitive work for your ticket (e.g. lots of data entry, setting up a new farm a certain way every time you want to test your code, unclaiming sensors with a third party API every time you want to test your code), create a script to help that process along and share it both in the comments on your PR and with Mwayanjana Bolokonya (Unlicensed)