What is another word for more bit-by-bit?
Pronunciation: [mˈɔː bˈɪtba͡ɪbˈɪt] (IPA) 
When it comes to describing something that happens gradually, there are plenty of synonyms to choose from that convey the same idea as "more bit-by-bit." For example, you might use "slowly but surely" to suggest that something is happening gradually but consistently. "Step by step" is another option that implies a slow and measured pace, while "inch by inch" suggests a slow but steady progression. Other options include "little by little," which emphasizes a gradual process of accumulation, and "gradually," which simply suggests a slow and steady pace. Whatever synonym you choose, it should convey a sense of gradualness and progression over time.
