Diamondback Bicycles Wildwood Classic Comfort Bike

What may help the most is tire width. From sidewall to sidewall, the old bike’s tires are 1 1/2 inches wide, the new one 2 inches. Significant difference with just a half inch. The DB (Diamondback) feels quite solid. Trade-off? The welds are far smoother on the bike from the bigger mass producer. (My old bike cost twice as much, though.)

https://www.amazon.com/Diamondback-Bicycles-Wildwood-Classic-Comfort/dp/B01HHQ1PJE