Probably one of these years because there was a great variety and level of quality on the whole from 2015-2017, some games lived longer than others but there was a lot of potential and fun to be had playing around this period. 2017 was probably the peak and it seems to have paled since
2015: MGS5, Cities skylines, Rocket League, Bloodborne, fallout 4, Fire Emblem Fates, Rainbow six siege
2016: FFXV, Stardew Valley, Overwatch, Battlefield 1, Dark Souls 3, XCOM 2, The Division, Darkest Dungeon, Shadowverse, Stellaris, Factorio, Hearts of Iron 4, Offworld trading company
2017: Fortnite, Nier:Automata, Persona 5, PUBG, Fire Emblem Echoes, Breath of the Wild, Horizon Zero Dawn, FFXIV Stormblood, Nioh, FFXII remake, For Honor
I think there have been some good games recently, Fortnite, Monster Hunter World, Apex Legends especially but it seems like a lot of the staples from the first half of the decade are still going pretty strong like League, CSGO, GTAV, Hearthstone, POE, SC2. Or games that are new improvements on big franchises like Smash Bros, MTG Arena, wow classic, modern warfare. It seems like there has been kind of a lull since that period in the middle of the decade where a lot of great, new games were flying out and now we are returning to the staple franchises. There were some cool new things like death stranding, code vein, spider-man game was cool, sekiro etc but it just isn't quite like what those years were like imo