Any guidence for investing & strategies / old money strategies

I am totally new in credit card with no cibil score

Was never Intrested in cc but for business (purchasing physical stocks & reselling it in 20-25 days) with 20-25% margin

Purchase in China & sell in USA

I am going to leverage money & use multiple cards for different flow afloat & use that interest free window highest is better

  Banks / Neobank / App - 

Rlb offer 62 days intrest period

Rbl with super card is 90 days

Kiwi 50 days

Viva money 52 days

Roar bank 62 days

Money tap rbl backed is credit card + credit line hybrid

Slice also same

Bank of India offers very less interest.

Even if I am not eligible I wish to know all for future plans to I am just starting business with small 1.5L 1000 $ +

   Looking for strategies as debt consolidation (i just discovered yesterday) 

Leverage / maintain & manage liquid. This terms were new to me & many Indian don't know of it to as corprate ambiance Being those odd person who wish to escape Indian system

I was looking for what are best cards available or best Neobank / finance & loan app with lowest interest available

Do you know what should I do, where can I look ? As I am new to reddit in such topics too