If you don’t have credit card/debit card/paypal account for DigitalOcean account, make an account on Cloudways, to get an absolutely free trial without credit card/paypal account but only for 3 days.
If you want free $25 credits (allowing you to sustain your server for more than just 3 days) then sign up using my referral link given below:
https://vrlps.co/ly8f22j/cp
Hope this helps !! 
For more details and verifying this info, visit: How To Get Free VPS On DigitalOcean Without A Credit Card yourself !