Making a Youtube Bot

Hi everyone,

I am trying to make a Youtube bot for subscribe\like via youtube api v3 but I face some problems and really need help from you guys.
What I've done so far:

1. Get refresh token of each account and store in database
2. Using Luminati proxies to send request for subscribe/like using those tokens.

It worked! I got about 100-200 subscribers per channel then it doesn't work at all after 1-2 days.
Requests sent successfully without errors but subscribers/likes don't increase.
Any idea?