As far as I can tell there really isn't anything like Intellij. What parts of Intellij are you desiring for DrRacket to handle? I guess it would be the project explorer, the git integration, the import linker, etc. I don't know much about Intellij because it is software that I would have to rent instead of own. Now, I am getting an urge to learn Intellij's plug-in interface to see if that is possible (because there are other Schemes I'd like tooling for as well and if that IDE could bring it then great).

If you aren't afraid of Emacs then give racket-mode a try. If you like VSCode there is some racket support extensions available. I have used both and if you can't stand Emacs the VSCode route is pretty good (just use VSCode extensions to do stuff). However, my private small form factor computer can't handle VSCode too well so it is Emacs or DrRacket (now I have a reason to how well it handles Intellij).

Given that Racket isn’t backed by a big institution I don’t think you’ll find better IDE than DrRacket, which is pretty powerful it just doesn’t look great.

Alternatively, as is the case with most lisp/scheme variants, emacs has pretty good support OR you can try the LSP extension for VSCode.

racket-mode is pretty great: https://racket-mode.com/

I’d like to second racket-mode with Emacs. If you want a ton of IDE-like smarts, fire up racket-xp-mode (racket eXPlore mode, comes bundled with racket-mode). Pairs nicely with other good things in the Emacs ecosystem.