If you wish to reach your members, you can:
1) Post on group notes, but it may be pushed down to another page before members log in and many ignore group notes be settings or clicking "ignore all"
2) Send a news, but as you have seen after change, only 0.4% ses those news
3) Which leaves you with: PM members individually. It is very time consuming and be sure to individualize each message as to not get caught in spam filter. If you are not a premium member, you may need to put some delay in between each message.
Hopefully, once news has been fixed, you can use those again. They used to be effective in reaching your groups members.
False alarm. It appears that the news fix has not been deployed yet.
If you post news from V3, then you will get an alert which takes you directly to the news item (for members in V3):
(V2 does not understand these new alerts so it continues to use the old ones that take you the main news page instead.)