If the resistance adjustment screw can't provide more resistance, then the brake pad is worn. I suggest you contact the manufacturer for replacement. At present, there are two kinds of brake pads for spinning bicycles: wool felt and cowhide. Cowhide is durable, but the price is high. See if there's a match. It's relatively simple to replace, just something with a little hands-on ability. Remember, because different manufacturers have different designs, there are two-sided gate type and down-pressing type, you must find the original parts to replace.