You have to read 20 episodes for 3 passes every 4 hours and 40 episodes for 4 passes every 4 hours
The maximum amount of passes you are allowed on refills is 4 passes every 4 hours.
Another way is to complete those daily challenges
You’ll have to read about 4-5 chapters to get your reward, which will be an extra pass.
You can also purchase more passes from the store.
There’s even an unlimited passes option, which lasts for 30 days.
On this in general, everything! All other tips and opportunities are likely cheating.
Everything is not as bad as it may seem! I have received and still receive many gems. Look for the inscription "Earn Gems" in the stories, and after reading you can get free gems and exchange gems for passes. Here are some stories with rewards: "The Mystery of the Rain" by Joseph Evans, "The Baby Project".
One of the best ways to get a lot of gems is daily offers, open the application and look in the menu, go to the category "Hidden Gems", choose any story and be careful in finding gems.