Clear the cache on the smarters app How to Clear Cache on FireStick for Smooth Streaming
Reboot device and router by switching both off at the mains.
Double check parent settings are switched off - sometimes the isp turns them back on.
Put a speed test app directly on the firestick and run a test.
Ask if the seller has a support group (Telegram, discord, whatsapp etc) and join, ask if anyone else is having the same issue, with the same channel at the same time as you are.
Don't get another trial or subscription till you've gone through the basic troubleshooting or you'll just be throwing money away to probably have the same issue.
Reboot device and router by switching both off at the mains.
Double check parent settings are switched off - sometimes the isp turns them back on.
Put a speed test app directly on the firestick and run a test.
Ask if the seller has a support group (Telegram, discord, whatsapp etc) and join, ask if anyone else is having the same issue, with the same channel at the same time as you are.
Don't get another trial or subscription till you've gone through the basic troubleshooting or you'll just be throwing money away to probably have the same issue.