- Name special variables with stars around the name. Otherwise you can unintentionally bind variables dynamically when you meant to bind them lexically

- Export symbols from your library package, then make new packages that either :use the library package, or just use qualified symbols. Don’t make applications that are in the package of the library

- Indent conventionally. Your DEFUN and IF are way over to the right.

- Use conventional names.

- consider making a WITH-DIB macro to manage loading and releasing resources

- Don’t use LOAD in source files to get your system into shape, use a system definition

Hope this helps…