Since you don't do well with earplugs, you could try "hairband headphones" (not sure if this the correct term) with white noise or rain noises. They are flat and can supposedly be used even if you're a side sleeper. I personally haven't tried them yet, so take this with a grain of salt.
HoneyChilliLimey t1_jefhofu wrote
Reply to LPT Request: How to deal mentally with nightly noise during the summer months by Bart-MS
Since you don't do well with earplugs, you could try "hairband headphones" (not sure if this the correct term) with white noise or rain noises. They are flat and can supposedly be used even if you're a side sleeper. I personally haven't tried them yet, so take this with a grain of salt.