Ok neither of these are easy but as a long term strategy to do think its best to day trade and try and get 1-2% a day or invest in a couple of coins and try and get 20% over a month
You need to have a huge capital to make a good spread if you are aiming 1-2% with daytrading and there are also factors like having many altcoins can be so stressful because a lot of them coud go down more than 2%. So the safe strategy is 20%-30% per month and if you start monitoring Eth, it is the best pick to do the swing trades. Eth plunges down 20%-30% in some weeks but will manage to go back up again and it kept happening for months.