Accepting inbound connections on your node so that you can seed blockchain data is a small way that you can improve the "health" of the Bitcoin network.
Run your Bitcoin full node to support Bitcoin network and also help yourself with better privacy. If you run your full node and broadcast your Bitcoin transaction by it, your privacy is better than if you only use a SPV wallet and have to connect to server, node in order to broadcast your Bitcoin transaction to Bitcoin mempools.
Bitcoin blockchain is secured by both network hashrate from Bitcoin miners and full node contribution to relay blockchain data to other nodes and keep many copies of Bitcoin blockchain in decentralized way.