The arduino Leonardo has 44 pins and is all around a step up for them Uno. But its 99.99% library compatible with the Uno. That means you can get a big upgrade and still use your old code base. To this end I've created two boards with hardware profiles I call the Splinter and the Shard. The splinter has all the pins broken out on the smallest board I could fit it on with all the pins and power controls. The Shard on the other hand doesn't have a regulator or pins or ports. Instead I made a Castellated board like an ESP board. The shard has strapping resistors the oscillator and decoupling capacitors. So you can treat it the same way you would with an ESP32. Aside from simplifying the components you would need on your own board, it also frees up the area under it that would otherwise be taken up by all the power runs and criss crosses needed to support at 32u4. Finally if you use EasyEDA I made a component for it so you can jsut search for Arduino Shard in User Contributed and drop in on your project. Oh and theres a version with built in ethernet!
IDK if anyone would even care but I like them so I'm making them 
If your interested I can share the designs or even sell completed boards.
Just thought I would share!
