Got NathanLr. Where do I branch off from here?

Since I have an A16 model and 16.5.1, it seemed like my best bet was going with NathanLr for some basic perks. However, I'm wanting to branch out a bit, but I'm not sure what things I can do since it's not a full jailbreak. I have Sileo and TrollStore, but what am I limited by with NathanLr, or what are some must-have side apps to start springing into other things (one for tweaks, one for themes, one for apps, etc.)?

I'd also love to get a new Reddit client for iOS that's not the default one. Anything like that?
Thanks in advance!