How to promote your group in other FB groups?

But now most of the group charge money to share post
There are countless number of groups. I have yet to come across a group that charges money for posts, but if some groups really do that, many don't. You can target those groups
 
Adding comments and links under the posts of other groups will help you promote your group in other groups.
 
You'll not get a lot of members by spamming. Back in the day I used to create profiles and post relevant comments in multiple groups. Make girls profiles, people are going to send you a friend request and then you can add them to your group. I've added tens of thousands of people this way. I stopped doing this years back. I'm sure this still works. You just have to figure out creating fake profiles without getting banned.
What use do I have of horny guys in my friend list when my group is about pictures of dogs for example..
 
You can join other groups related to your niche and try to participate in them. You can share some content and win the trust of admins to cross post in their groups. I don't think there is any other way except paying the admins.
 
How many comments with link to my group would it be safe to do/day? I have a 4 years old acc with activity.
I think there is no limit. As long as you follow the group rules. Anw I tried to push 10+ comments before (followed strictly the group rules) for 1 month then still got banned. So I suggest finding as many groups as you can to back up
 
If your audience is not very large, you can try to communicate with the group members one by one. Otherwise, I'm sure you will be banned from the group. Have you considered offering a small amount of money to the group admins?
 
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