Apart from profitability, for the Monero network it doesn't make a big difference if you solo-mine or not.
This answer to Is it better to mine Monero on solo mining or joining a mining pool? suggested to me a new question: which is the best way for a single user to help the Monero network?
Running a full Monero network node?
Doing solo mining? Pool mining?
Or something different.
There are many ways to help the Monero both directly and indirectly.
Run a full node to directly support the network
Donate to the Monero Forum Funding System
Join a Monero workgroup for mining, support, or any others
Participate in many of the Monero forums, such as here on the Stackexchange, on Reddit, Quora, etc
Learn as much about Monero as you can so you can help others
Join a local cryptocurrency/Monero meetup or start your own
Contribute to the Monero Ecosystem project
Run as a solo miner or join a small pool to help decententralization aspects
You could additionally set up a mining rig, to both equalize on profits and make your hashpower of larger significance.
Running a full node with both in and outbound connections on the p2p ports.
