Payment history comes first
Late payments are usually more damaging than small changes in utilization or account mix. Automatic minimum payments are not glamorous, but they protect the foundation.
Utilization matters because it signals pressure
Using a large share of available revolving credit can suggest financial stress. Paying balances before statement dates, requesting appropriate limits and spreading spending carefully can help keep utilization controlled.
Do not close old accounts casually
Older accounts can support the average age of your credit history. If a card has no fee and no security issue, closing it may not be necessary.
Avoid myth-based moves
You do not need to carry interest to build credit. You do not need constant new cards. You do not need complicated hacks. The boring path is often the strongest path.
Think like a lender
A strong profile says: this person pays on time, does not depend heavily on borrowed money and has managed accounts through different conditions.