I have two 2tb nvme SSDs, 4 tb in total - is it worth mining chia for me and what income should I expect?
chiacalculator.com and read the Wiki.
40 plots 3.96 TiB = $403.75 per month, correct?
I don’t know. The calculator is a mathematical model. An educated guess by some smart people. If you put in the numbers relevant to you, then that’s the best info you’ve got.
Ok. is it possible to win a chia using 4tb nvme ssd disk space, realistically? And how much time it might take?
Yes, over time.
Nobody will be able to tell you that, it’s a game of chance. Sometimes you’re lucky and it happens in a few days, sometimes you’re unlucky and it takes years.
And: no, there is no way to improve your chances, the only way to get a better chance is to create more plots.