@DrSandraDuffy toot! app for iPhone can follow multiple servers, and read local timelines with flipping each other. https://apps.apple.com/jp/app/toot/id1229021451?l=en
The one thing I wish I could do on Mastodon is follow local feeds from other areas of interest. I want scholar.social and photog.social and hcommons.social and tons of others!