Yea there is safe way for 1.5% monthly interest but you can make even more why not.I have strategy for you which can give you a perfect income more than 1.5% monthly what is very low interest which is not a really profitable.It also depends on you how much you want invest so you ask for lower interest.There are hyip ,ptc sites or revenue share sites which gives you 110-150% roi and they are good for invest own money for nice profit.If you invest in revenue share sites which 120% roi then you can invest for a years and  still get payment because roi 120% can be easy to pay but I know only revenue share called mypayingads and mypayingcryptoads which are safety for invest and i offer RCB(referral cash back) if somebody invest via my link.There is also hyip type of site where you invest when you check reviews and you need to find site like that in prelaunch version to start earning nice profit but dont stay forever there just invest some amount and withdrawal that investment and then reinvest your one part of profit and other part withrawal.