Hello,
When i was using twiter, few years back, there was a tone of free programs to use for follw and unfollow to gain more followers
Is it the same now or they got all this restrictions like instagram??
We’re not sure of any free programs but we’re definitely sure that Jarvee can help you with that 
You can get the first 5 days for free as a trial via JARVEE - Social Media Posting and Automation
All platforms change over time and of course, there will be limits. When it comes to automation, doing things slowly and gradually increasing is the key.