I practically stopped buying a ton of games 3 years ago 2017 after I bought some too many games from German board games stores during the Christmas sales and my last visit to Spiel in Essen. I noticed that my collection was huge (still under 100) and that we can’t play everything as it deserves to be played.
So I stopped watching SUSD and other board game youtubers, so I don’t hear much about new games which is great 
I still bought some games or got some as presents in the last three years. All in all under 10 games though. This year I bought my wife 2 christmas presents (Cottage Garden, Dragon Castle) and got 2 from her (5 Minute Dungeon + 1 expansion). The Kitchen Rush expansion because my loves the game, then Decrypto because we played a beta version at Spiel 2017 and we liked it a lot, so that was a 2018 purchase. The Gloomhaven expansion as one of the most played games in our collection. Fog of Love and the new beautiful Parade version (with the Alice theme) as presents from my in-laws. That’s roughly it (could be I forgot something).
I notice a theme there… I try to adapt my collection more to my wife’s tastes which is very smart because I almost never play games without her 
But yeah it was VERY liberating just to ignore a big aspect of one of my core hobbies and to focus on the games I had. We have so many excellent games and Gloomhaven took so much space and time up anyways 
It was time to say “Stop, I own enough.” and it was great. Don’t regret it at all
I avoided Kickstarters in general because I learned from PC games kickstarters that my excitement or interest often wanes a lot till the game is ready to play (even if it is a good game, don’t want to talk about bad games). This seems to me to be true for board game kickstarters too.
That’s the reason I didn’t back Frosthaven last year. I told my group, you know if we want to play it after it is available then I am willing to pay some extra money to avoid the risk of having a huge and expensive game lying around.
So maybe this is helpful to some others how I started to view my collection and how I reduced my spending by a lot while still enjoying the hobby.
But now to my new year’s resolution:
-I still have too many unplayed games, it is time to get them more on the table