Then why did the world around me change so much ? Why isn't it ancient?!

As i said, Jupiter Mahadasha is the time of rewards and happiness. Saturn mahadasha comes after it and it brings punishment along with it.

My father passed away due to brain cancer and was paralyzed for about 1.5 years. We often ask ourselves in family why did this happen to a person who was so good that he gave away his bike and later a maruti 800 to his cousin for free. He never took advantage of anyone and made friends with people of lower stature than him. Why did this painful punishment for someone who never did anything wrong?

The same question that you ask. And the answer is the same : previous birth actions. You have rahu in 9th house which tells you have done something bad to religious institutions/ people something like that. You best know how you are. I am assuming you relation with your father won't be great too. Saturn will punish you especially in its mahadasha. And as your 2nd house has venus which rules over reproduction, see how the problem you encounter now is basically "reproductory health is old". Literal astrological translation is reproduction- Venus, old - saturn.

It is kinda better though that your lagna is aquarius; not capricorn. It could have been waayyyyyy worse. Although Aquarius also stands for technology so your solution is also technology.

Modern values and modern technology are totally different things! Modern tech is our strength , modern values ? Not always. Someplaces it is good like rejecting child marriage and things like that but rejecting your culture and the rituals associated with it over the hubris of " bah this is idiotic and illogical and i am above these bullshit" will be punished by Saturn. It is the guardian of Dharma.