I have found this wonderful free app called My Noise at https://mynoise.net/
I downloaded it onto my phone and it has become a nightly ritual to fall asleep with. It has a selection of free audio tracks and then a selection to purchase. I love the sound of running water gentle waves or rain when falling asleep.
Sometimes when I am writing I will put on the Folk Traditions or the Bells.
You can also listen to it on your web browser. Right now I am listening to Irish Coastline.
Each noise generator comes with a color coded set of bar to maximize your listening by tuning up individual areas of the sounds you like – I always turn up crashing waves and pebble beach on coastal sounds.
The gentleman that put this together is a genius in my opinion. Give it a try. Definitely rates 5 stars (more like 100 in my view).