if you fancy something at a good price and DIY then try
https://www.modulargrid.net/e/ai-synthesis-ai008-eurorack-matrix-mixer
Good for signal routing, modulation, effects sends etc

Enjoy your spare HP, don't rush to fill every last space, this is not like filling sticker books. Resist the urge to 'complete' your rack, its never complete so just relax.

https://youtube.com/@wishbonebrewery