You cannot host a 24/7 Lavalink node for $0 with zero effort. Every truly free option either:
This method requires advanced knowledge. You run Lavalink as a container. Google Cloud Run only charges when the container is handling traffic. You use Cloud Scheduler to ping the server every 5 minutes to keep it "warm." lavalink hosting free free
If you want 24/7, low-latency music:
Google offers an "Always Free" e2-micro instance. While the specs are much lower than Oracle, it can run a minimal Lavalink instance. You cannot host a 24/7 Lavalink node for $0 with zero effort