I love all the apps that are being made, each one has something new to bring, but I have yet to see one implement a community grouping option. Something to view all your communities that revolve around the same theme in one wall. Kind of like mini homes. So far the only alternative I found is making separate accounts, follow only one theme and change between them but it’s definitely not ideal.
there are a couple of issues on github related to doing this natively through lemmy
i will find and link them in the morning, but try searching https://github.com/lemmynet/lemmy for “multireddits” and “tags”
edit
#818 - main issue
#3443 - supposed duplicate
#3700 - nested communities idea
#3071 - another supposed duplicate
#317 - somewhat related, post tags