Welcome [emoji4].
If its getting noticeably faster in safe mode, then you have most probably bloated the device (installed too many apps). You need to greenify few apps. Greenify atleast Facebook and Messenger, the two culprits.
Unnecessary features like, Bluetooth, wake up motion gestures, wifi, wifi hotspot, screen mirroring, sync, custom launchers etc. Only use them when really required. You can keep WiFi on as long as its connected to Internet.
When you upgrade your phone next time, don't forget to get atleast 2GB RAM phone!. 1GB RAM cannot handle too many apps and then phone get slow.