I recommend reading up on Andy Weir as he started out self-publishing and was eventually approached by a publisher... https://en.m.wikipedia.org/wiki/Andy_Weir

I recommend reading up on Andy Weir as he started out self-publishing and was eventually approached by a publisher... https://en.m.wikipedia.org/wiki/Andy_Weir https://en.m.wikipedia.org/wiki/Andy_Weir The other author I am familiar with is Tui Sutherland who started out working at a publishing house, then working on the Warriors book series with several other authors before starting her own series Wings of Fire.