The right Strategy for my Products Marketing ?

Hello Community, Hope you're doing well during this hard days.

I'm new in the Online Business world, i'm 26 years old.
I've always been passionate about the Commerce industry. That's why I decided to start my E-commerce Journey (especially DropShipping in the beginnings).
My question is : As a beginner with few money in my pocket, what is better for my products marketing ? Build some instagram accounts for my ads (3 accounts for 3 niche products), and try to make them grow and gain true followers as fast as possible in order to minimise Ads's expenses, But this will take a year at least ! But i will gain more passive income in the long term.
Or stick to Facebook Ads and Google Ads strategy, and spend some extra money because it's the right way to do it ?
I have this question for about a month, I'm confused. I created 3 IG accounts, but i found it hard to gain some followers even that i choosed good niches, so I feel like i'm wasting time and energy (and time is money).
What is your advices and what's the right strategy for both sides, short and long term ? knowing that I want to make a career in this business, at least for the next 10 years.

Thank you, and i'll be really grateful for your support.