Dear Liz: I have an 834 credit score, with three credit cards. I don’t carry debt or pay annual fees. I’m considering closing one of my cards and replacing it with one available through my credit union. Is it worth the hassle?

Answer: Closing accounts won’t help your credit scores and may hurt them. If there’s no compelling reason to close a card, you might consider leaving the account open and using the card occasionally to prevent the issuer from closing it.

You also might want to rethink your stance on annual fees. These days, few cards without annual fees offer rewards, while many cards offer rewards that more than offset their fees. If you’re new to the rewards card world, consider getting a simple cash-back card. If you’re interested in travel benefits, look for a card that gives you points that you can transfer to frequent traveler programs.

If you’re determined to close the account and open another, apply for the new card first since the closure may drop your scores.

Dear Liz: I recently applied online for a credit card and was rejected, as my credit reports were frozen. I thawed them and applied again, only to be declined again. I received a letter stating that the rejection was because I have no installment credit history. I have no debt, credit scores in the mid-800s and $2 million in retirement accounts. Our paid-for home is valued at approximately $1million. This makes zero sense.

Answer: Federal law requires credit card issuers to send the “adverse action” letter you received to explain why your application was denied. But that letter doesn’t have to be the last word.

You can call the issuer and politely ask that your application be reconsidered. Most credit applications are evaluated by algorithms, rather than people. Getting a human involved can make all the difference, so you’ll want to get this person on your side. Be friendly and polite.

Mention all of the factors in your favor, such as a steady income and a (presumably) long history of handling credit cards responsibly. Explain that you don’t have an installment loan, such as a mortgage, because your home is paid off. If you have an existing relationship with the issuer, such as other credit cards or bank accounts, mention that as well.

There are no guarantees you’ll be successful if you ask, but you’re guaranteed not to get the card if you don’t ask. Good luck!