I'm no expert, but I also once had a lot of cards like that, in some cases more than one issued by the same bank due to business buyouts and merchant changes. I *believe* that asking a bank to consolidate multiple lines of credit into one account does less to hurt you than full account closure. Also, there should be a note on any closure that you ask for, that says something like "closed at account holder's request", which makes it clear that it was not closed for failure to pay.
All of the cards I have now I use for everyday purchases like gasoline and toiletries, all of them are reward cards, and all of them are paid off in full each month by automatic payment. I use an
Amazon card for gasoline, and earn enough back to cover nearly all my Amazon purchases that way, including the Prime fee, which gives me a painless way to pay for movie streaming.
(BTW, never use a debit card at a gasoline pump; skimmers are too much of a risk. A credit card is not nearly as risky because there are loss limits in place once the theft is discovered. Just set it to automatically pay off every month.)