Replace the stupid low spoke count wheels built with cheap straight gauge spokes and cheap non-Shimano hubs with proper handbuilt wheels. There is no excuse for having less than 36 spoke per wheel, or for using straight gauge spokes, non-Shimano hubs or non double eyelet rims for that matter.
Those wheels that the e-bike came with are a major design fault. There is no way the spokes can be tightened enough to make the low spoke count wheels having non double eyelet rims last. The straight gauge spokes are less flexible than triple butted spokes, and therefore, the load is distributed to far fewer spokes than on triple butted spokes.
In principle, it might be a good idea to have the shop where you bought the bike from to tighten the spokes and true the wheels so that you have the original wheels for warranty purposes, but there's no way that 28-spoked straight gauge spoked wheels can last. The spokes cannot be made tight or else the non double eyelet rims will be damaged.
When hand-building the replacement wheels, select Shimano hubs. They have proper angular contact cup and cone bearings that are adjustable and the freewheel side bearing is near the end of the axle, thus making the axle last longer. Unlike non-Shimano hubs that have noisy freewheels, Shimano freewheels are very silent.
The replacement rims should be 36 spoke holed double wall aluminum rims with double eyelets / sockets. Do not select anodized rims or else they'll start to crack.
The replacement spokes could be either DT Swiss Competition 1.8/1.6/1.8mm spokes or DT Swiss Alpine III 2.34/1.8/2.0mm spokes. The Alpine III spokes have slightly better seat at the hub spoke holes, but the Competition 1.6mm spokes are slightly more flexible, thus distributing the spoke load over a larger number of spokes.
The nipples should be brass, naturally, and not aluminum.