if you're ahead of schedule, you should stay ahead of schedule, that way eventually the entire game gets completed and release earlier!
obviously you have personal physical and mental health to look after, not to mention unforeseen IRL stuff that'd demand slowing or halting development cycles, but being ahead of schedule a great thing that shouldn't be squandered!
if staying ahead of schedule sounds undesirable, perhaps preemptive bug fixing or even a patreon exclusive beta test to look for bugs might be a good use of extra time?