In my experience as a hiring manager it was quite rare to see lots of OSS work in candidates’ GitHub accounts, but I’d absolutely prioritize those that had good work in OSS. (Also worth emphasizing that technical design, collaboration, and documentation are important and underrated, and can also be showcased in an OSS project. If you can demonstrate good communications in an async OSS environment, that would probably reflect well on your ability to contribute as a remote employee.)
All that said I’m not sure that OSS is the best resume builder. For big companies you need to drill LeetCode and system design. Perhaps for startups it is not the worst use of your time.