I'll ask the questions but you don't need to answer them here...
What significant things have happened in your life in the past 5 years? Things r/t your health (or others), employment, income, family, fitness, and other things you might consider important.
These are all potential things to steal your attention and energy, taking you away from the enjoyment that hunting once provided. I tend to think we don't just fade away from outdoor pursuits. Instead, I think life and all it holds slowly takes hold and gradually makes our pursuits less imperative. You go from 'can't stay home' to 'can't make myself go' over a significant period of time.
Thinking it will change on its own is highly unlikely. If things have changed in your life, you'll need to address them and get those roadblocks to fun out of your way. The drive and desire is still possible...you'll have to uncover it.