I think maintaining a lightning wallet and a seperate on-chain wallet makes the most sense. You keep 50k sats in your lightning wallet, for zaps and lightning payments, and the rest you keep in your on-chain wallet. That's your savings. And you can move sats from your lightning wallet to your on-chain wallet when it has accumulated a certain amount. This way, you're keeping enough sats to zap others and pay any expenses you may have, while adding to your on-chain savings on a regular basis. And if you're making monthly purchases of bitcoin, those go to your on-chain wallet.