You may also want to try to add a couple more relays? The four you have are great. I’ve found six is my sweet spot. Your mileage may vary.
Discussion
As a beginner here, excuse my ignorance but can you explain relays and how and which ones to add?
I want to learn too
Which client are you using?
Here is some great info. https://www.voltage.cloud/blog/the-essential-guide-to-nostr-relays