Facebook changes his algorithm everytime. Now again for connecting people again, instead pages.
You can try paying ads to get a boost, because Facebook may have changed so non-ads pages will drop, so they have to pay ad. Facebook wants money.
Talk with someone who had the same reach, but did pay for ads already before. Then check if his reach also dropped or not. I would also be interested in this, because then we can maybe clearly see if facebook now de-prioritise pages with no ads. Would make sense, because you can see we suggest already trying it with paying ads. Thats what facebook wants.
Also you HAD already a big reach and if facebook drops your decrease, you are pushed for paying, because of course you want your reach back. Psychological de-motivation or more "punishing" with the chance "but pay, then you get your chocolate back".