1.Day trading or short term trading?
If you are looking for profits of 10-20% monthly then I guess short term trading suits you best. You can get that margin of profit monthly by short term trading.
2.Crypto to crypto or crypto to fiat trading?
Crypto to fiat is more suited for short term trading with the result of a 10-20% margin of income for you.
But OP need to focus this what they want to do as trader. Short term trading is need a lot of quality time and focus to monitor the up amd down.
Fiat to crypro vice versa trading localbitcoin ia suit but always remember expect the risk to avoid a lot of loses.