you can do altcoin mining if you think bitcoin mining is very expensive and not affordable. mine altcoin and sell them for bitcoin. it is very profitable nowadays.
well in mining you have to pay your rig, your internet, your electricity and the maintenance. If you are targeting bitcoin, it won't be wise, instead target those coin that are asic resistant. Research for new and promising PoW coins or hybrid. Mostly coins are profitable only if their difficulty is low or are very indemand in an exchange.
do you know what is POS.
POS is Proof of stake. some altcoins use POS algorithm . you need to buy some coins and hold them in your wallet. and then you need to open wallet everyday and keep the wallet open. you'll get some POS shares everyday.
it similar to mining but better than mining so much.. and easier too.