you might want to check out this page to find popular tags. don't just check by how much money they make because the more post the tag has, the less chance your post will be seen.

for example:
#life tag is the most popular and best paying tag with 11,805,413.978 SBD payout. however there is 663,937 post created in this category. which means that in average a post would receive 17 SBD. i would not recommend it because your post will get lost between those 600k😐
but:
#adventure tag has "only" 346,035.044 SBD payout for 13,237 posts. that means that in average a post gets 26 SBD. also you have better chance to compete as there is only 13k posts made each week.

of course if your group has nothing to do with #adventure, don't use it. you can find your relevant tag if you spend some time😀