Well as the mining gets distributed once a cryptocurrency becomes more popular, a "normal" user wont have any chance mining valid blocks against people that run mining farms.
PoW solo mining without using a pool is only effective at brand new coins as the mining difficulty wont be high and have low total hashpower in general.

For coins powered by the Proof of Work consensus, you suddenly cannot get around mining pools. If using mining pools, I always recommend to regularly withdraw the earnings from time to time.