Google play service is draining my battery alot, one ui is also running in the back ground and samsung keyboard. I have tried everything to fix this issue and it didn't work. Next time when you release a update could you able to consider this in the update so this will increase battery life.
The One UI and keyboard have to run or your phone won't work. How much battery is Play Services using? It is resource hungry. You shouldn't worry too much about background apps as Android makes efficient use of RAM, unlike a PC.