Carefully consider the cards and how they suit you. Don't just assume Platinum>PRG>Green. Don't select a card based only on perceived approval odds.
If you want to accrue points then you should look at the earn rates on the cards you're considering. The Platinum is a poor choice for earning MR points.
You should also consider whether or not you can really redeem MR points to make the most value out of them. If not, it may not be worth dealing with MR.
Yzr23 wrote:Two delinquencies In two years.
See what you can do to address these before you apply for anything. Derogs tend to have a significant impact and hold one's scores down. DO whatever it takes to avoid derogs in future. Use autopay if it would be of benefit to you. Make sure you're actively monitoring your accounts. An unexpected charge should not go unnoticed and cause a 30+ day late if you're properly monitoring your accounts.
Yzr23 wrote:I cancelled the card out of spite which seemingly wasn’t the best idea.
Think things through and react rationally instead of emotionally. Closing it probably didn't help your situation.