The alternatives to eth are not lacking obviously you will never have the same earnings i would say that you can easily choose between etc, raven, ergo, ethw i would suggest you try them all and see which is the most performing with your equipment
Right now if I had to choose I would go with ETHW.Why you may ask?That is simple because it has the lowest difficulty compared to ETC and ERGO and the price is super cheap.I know it got hacked pretty soon but that was on an exchange and not on your personal Metamask wallet so I would not care much about that news yet,one has only benefits to get from this coin if all the predictions come true and it goes like at least the all time high of ETC at 179 USD for a coin.Right now a 300 Mhsh rig does more than 4 such coins monthly,for the future it is the best investment anyone can make in my opinion.
The price of the coin will not rise quickly. And if you are right, then as the price of a coin rises, its hashrate will grow with the arrival of new miners and the number of mined coins per month will fall. It is better to buy this coin now for 6-7 dollars.