How can I increase the playlist limit on my apple watch 4?

This might help....How to change the playlist limit on Apple Watch

1. On your iPhone, open the Apple Watch app.
2. Scroll down and tap Music.
3. Tap Playlist Limit.
4. Tap Storage to set a storage limit.
5. Tap the maximum amount of storage you want to sync to your Apple Watch.
6. Tap Songs to set a song limit.

Also, I read where the limit is 250 songs or 2 GB.

You can have more then on playlist. Go to Apple Watch app > Music > add playlists

You may have used up all of your storage space. See if you can delete some of your other data.

How many songs have you got on the Watch? Go to settings on Watch app and go to about and it will tell you

Your question has been asked before, but not answered to the poster's satisfaction. Why don't you call Apple Support and ask them?

So you should be able to play play lists. I trying to understand how or why you believe you are only able to play 100 songs? Can you explain further?