Hi,
You’ve indeed started Maha-Dasha of Rahu from February 2024 (as per Vimsottari Dasha system). He seems to be placed mischievously. Apart from him, I’d like to call out the need for you to be cautious of Ketu, who is placed in the 10th house of Karma-Sthana and posited in the Lunar Constellation of Shatabisha Nakshatra, ruled by Rahu.
Given the situation, it would make sense for you to consider propitiating Rahu-Ketu.
As for your other question… I’m sure you’ll understand and agree your situation will have some effects on folk around you. Likewise, any good from their lives can help uplift your situation… this is called collective or shared Karma.
Take care…