Yeah, there’s a better way. Study your cards as they are normally scheduled, actually grade them, and then use Filtered decks for more focused study on whatever cards or subjects you’re worried about. Pretty much anything you can search for, you can build a Filtered deck for, so if that’s cards that have longer intervals, or cards that you haven’t studied in the past 30 days – you can do it that way.
If you’re concerned overall about the length of your intervals because you’re not reaching your retention goals – and you’re using FSRS – you can adjust your Desired Retention to shorten your intervals. But if you are reaching your retention goals, that’s a good sign that your cards are already being scheduled correctly.