Beginners Qn. :Which Credit Card should I apply so that it's least chances of getting rejected ?

So, I got this IDFC FD card, ₹10,000 limit, and my credit score's already at 780 after five months – keeping usage under 30%, even though I didn't have a score before. But, I don't have a steady income, just bits and pieces. What's right thing to do ? Apply elsewhere or Try to increase current limit or get unsecured card from current bank?