1. Remove the crank so you can access the chainring bolt behind the crank.
2. Remove the chain guard so you can see how the ring interfaces with the crank spider.
3. Measure the bolt center diameter (BCD). That will be the centerline distance between two opposite bolts.
4. Go online and search for 1x chainrings having the 4-bolt pattern, BCD, and tooth count that you desire.
5. You might need a longer chain.
6. Put it all back together.
Or, learn to pedal faster. Seriously, reputable vendors of e-bikes choose their gearing carefully for the job at hand, and it's better for your legs.