Nothing wrong with the Rode NT1, it’s a very good microphone for it’s price range but as with all condenser mics it needs to be used in the correct environment.
Is your environment acoustically treated? If not that’s your issue right there. You could spend £1000 on a TLM103 and it would sound awful in the wrong environment.
My advice would be to add some acoustic treatment to improve the room acoustics which will give you a much better sound from your NT1.
Another option is to use a dynamic mic but I’d wager the sound you’d get from an NT1 in a properly treated environment would be better than the sound from a dynamic mic of a similar price range as condenser mics have a greater range and often better “warmth” to their sound.