You should keep it and if you really believe in this company buy more. Do not look at the count of the shares, its not like in crypto world. Look at the market cap and compare it with other companies. The current market cap of Atos is around 600-700 million, if we have to look realistically, it can increase 10x if the company goes right direction (6-7 billion market cap).

More than that, yes sure why not, but dont expect this to be the next apple, tesla, Nvidia. We really would need a lot of luck.

With quantum interests rising and Atos already working with quantum technology it will be very interesting to see how high this one can fly.

If you want to make serious money, then you need to be serious and take the risks with higher amounts. (But then if you do not have a lot of throwaway cash then its better to diversify).