I can't stress enough the benefits of using hashtags on Twitter. They spread your tweets to a much wider audience. Not only are you dealing with dispersed attention due to other social networks, you also have to be aware of shadow banning.
Tweet about the "wrong" subject or critique a favoured politician and Twitter can halt your growth in it's tracks.
I know from first-hand experience, from the 2016 election. As soon as I dared to criticize their chosen candidate, my growth stopped, hitting a wall around 12k.
My steady, predictable rise in followers evaporated and after watching Jack being interviewed on Joe Rogan, it was obvious what happened. Just something you might want to be aware of in order to keep other social media alternatives in mind...