Only $5.8068 is monthly income from the masternode. now it is on the verge of profitability.
does anyone have a suggestion for cheaper VPS hosting service than Vultr ($5 monthly)
Not yet!
By now, $5 cost per month is the lowest price of VPS service which we can find.
Unfortunately, you invested your money into shitty project that even almost can not give enough monthly income to pay for VPS costs (it should be in the near future).