I'm greedy for fresh new sounds, which is why I choose to stick to fewer synths than I have before.
It seems silly, but the more synths I add to the studio, the less fresh new sounds I will have at my disposal.
When you know what you want, new synths can hinder the journey towards getting what you want, whereas the synths you know well tend to support this journey.
Ask yourself this question before you explore the rabbit hole of new instruments :)
I hope this helps!