Since, ones mindset can be changed, it's better for one to develop a growth mindset towards all one's activities in life to achieve a great result. Develop a growth mindset toward all your goals today to improve on your business, studies, etc.
Both mindsets will earn success( one step away) but those who have a growth mindset, and the meaning itself will tell us that there are more improvements happen than those who have a fixed mindset. But of course, a fixed mindset can be changed if they are open-minded and if they are looking for more opportunities. But either of the two we belong if we don't work hard and no action is taken, nothing happens.
Mindset + action = success
Mindset + no action = fail
In my opinion, a developing mindset, of course, they will do new things which of course are for their own good in the future, also with those who have a developing mindset, of course they have a desire for their lives to develop and if they do a new thing and then fail, I don't think they will stop, they will continue to do it by understanding the mistakes that have been made so that they don't happen again in the future, people who have this mindset tend to be rarely found.
because what I see today is that many people don't do anything good, I mean they tend to be stuck in a comfort zone so they are reluctant to move forward and that's because they are already stuck in a comfort zone and also afraid of failing by doing new things. but this can be changed as you said. a fixed mindset in my opinion tends not to have clear development, it is likely that they will only do the same thing.
I agree with you, about the mindset that is accompanied by action it will produce something good or success. and vice versa, with a mindset and no action it's the same lie so there is likely to be no good results or it could be a failure.