I just said I was rate-limited; it turns out that the previous proxy I used turned into a "ten thousand riders" setup. The purity score was only 62 points, and the user count showed as high risk, which scared me into immediately switching to five different airport nodes for testing. Eventually, I found an airport node with a purity score of 80, but ping tests still showed "ten thousand riders." However, the IP trust score increased. Then I thought about whether I should build my own VPS or choose to disguise with a static IP. In the end, I chose chain proxy static IP. I spent a whole morning on this. Here's the tutorial:

First, prepare a static SOCKS5 IP, which I bought for $3.50. Also, have the Nekobox mobile app ready.
1⃣ Open the Nekobox app, swipe left to select "Groups."
2⃣ Tap the + icon in the top right corner to add a group, name it "Subscription," select "Subscription" as the group type, then enter your subscription link below and tap save.
Next, create another group, set the type to "Basic," and name it "Chain Proxy," used for adding your static IP later.
3⃣ Return to the homepage, select the "Chain Proxy" group, tap the pencil icon to add your purchased static IP proxy details, including proxy port, username, etc., then tap the checkmark in the top right corner to save.
4⃣ Go back to the homepage, swipe left on the group list, enter, then open the second "Chain Proxy" group. Tap the pencil icon on the right to find the "Pre-proxy" setting, select a reliable node from your airport as the pre-proxy, then save the configuration.
5⃣ Tap to open the configuration, then select "Chain Proxy" again to successfully connect. Next, test the delay on a website to see if the IP address matches your purchased static IP proxy address. If it does, you've succeeded.