It's often assumed that because Twitter has a larger userbase than the Fediverse, that accounts would automatically get more followers there.
However, many accounts (especially FOSS projects) have more followers here on the Fediverse.
Some examples (as of 26th July 2021):
@email@example.com has 10.8k vs 7.33k on Twitter
@firstname.lastname@example.org has 1.57k vs 680 on Twitter
@Minetest@fosstodon.org has 1.39k vs 785 on Twitter
If you know any Libre projects that are yet to join the Fedi, please ask them to give it a go!