A lot of people complain about the game not receiving updates, being needing too much grinding, just getting boring. For me I can still tolerate some lack of changes and it being a bit grindy. For me, the reason I'm losing some interest in playing the game is that there's barely any players I can play with. Sometimes I join and only 1 or no guildmates are online. Even if they're online they can be AFK. I don't know if I should join a different guild or Spiral Knights is dying. Since Spiral Knights is an MMO, its gameplay usually is made around a 3 or 4 players in a party. Grinding in this game or any MMO feels more tedious when you're doing it by yourself. I hope the game's player base grows a little so there are more parties to join.
P. S. if there are any active guilds welcome to invite me. I'd accept and would probably play it more often.
I agree that grinding is less fun alone. However, almost all guilds go defunct after a couple of months. This happened even when the game was at its peak. The solution is either to work very hard to resurrect your guild (if you are a Guild Master or Officer) or to find another guild. Good luck.