All peripherals have the capacity to increase battery drain as they all are attached to the Mac and are being serviced by the Mac.
But their being attached does not change how the battery and its circuitry work in concert to maintain the battery. If the attached devices are having a major impact on the battery drain, then the charger will work harder and longer.
You can't change the design of the battery and the circuitry. It is what it is.
What exactly is not working "well" now that "was working well months ago"?
The simple fact is, until something actually fails, there's nothing to do. It may not be working the way you feel it should, or as well as you feel it should, I get that. But until it breaks there's no "fix" needed. You can't alter the basic design of the battery and its charging devices.
You may can get a "fast charging" charger, but I have no idea if it's appropriate for what you think is not working "well".
Maybe others have more suggestions.