Firstly, Big Kudos if you were able to bootstrap a big business this is very very hard (actually doing this with VC money is also hard). As someone who did both VC funded startup and self-funded (fuzzit.dev acquired by GitLab), I would say doing a self-funded startup even though it sounds good (because you are an underdog and you win on the hardest level if you succeed), a lot of time is really impossible or if possible there is information people are not sharing - for example for self-funded - did you include 300k-600k you had as saving that you used while working on it (or did you consulting while working on it). Did you take loans to grow faster? - the details are really important.

Personally I got to a conclusion that the common ground is a lot of time what makes sense. If you can validate as much as possible before raising the first round, raising reasonable amount of what you need to prove or get to the next milestone and do a lot of first principal thinking that could be better then beiing on each side of the extreme - let's raise as much as possible or Im not taking any VC money because it is all bad. Just my 2 cents but yes if you can grow a business with your own money - then it's amazing - just think this is not possible in a lot of cases and products.