A block of XMR is about 30 USD equivalent. If that is not something that will make or break you either way, you have nothing to fear from the variance of solo mining.
You'll need a consequent hash power to solo mine XMR these days
Not really. It isn't that well understood perhaps that every bit of hash power, however small, has a proportionately equal chance to solo a block. Even with just one desktop (200 h/s) computer you have roughly a 50% chance to score a block in a month. You could even get lucky and score a few blocks. Or you could very well get nothing. But your risk there (compared to roughly what you would get pool mining) is about 15 USD. That is hardly a major risk for many people.
If you want to help the network more than anything else, this the way to go.