Why I cannot change ringtone on my Alcatel 2008G

look here first?

https://nasupport.alcatelmobile.com/hc/en-us/categories/115000433268-Phones

Steps to change ringtone on a different model that may work:

Steps to change the phone ringtone for calls on your Alcatel OneTouch Retro

1. Press the Center key.
2. Scroll to Settings and press the Center key.
3. Scroll to Ringtones and press the Center key.
4. With Incoming calls highlighted, press the Center key.
5. With Contact Entries highlighted, press the Center key.
6. Scroll the preferred option and press the Center key.
7. Scroll to Preloaded and press the Center key.
8. Scroll to the preferred ringtone and press the Center key.

Steps to change the notification sound for emails and texts on your Alcatel OneTouch Retro

1. Press the Center key.
2. Scroll to Settings and press the Center key.
3. Scroll to Messages and press the Center key.
4. Scroll to Preloaded and press the Center key.
5. Scroll to the preferred ringtone and press the Center key.

https://www.scribd.com/document/364186681/User-Guide-en-Alcatel-2008G

https://www.scribd.com/document/364186681/User-Guide-en-Alcatel-2008G

Steps to change the phone ringtone for calls on your Alcatel OneTouch Retro

1. Press the Center key.
2. Scroll to Settings and press the Center key.
3. Scroll to Ringtones and press the Center key.
4. With Incoming calls highlighted, press the Center key.
5. With Contact Entries highlighted, press the Center key.
6. Scroll the preferred option and press the Center key.
7. Scroll to Preloaded and press the Center key.
8. Scroll to the preferred ringtone and press the Center key.

Steps to change the notification sound for emails and texts on your Alcatel OneTouch Retro

1. Press the Center key.
2. Scroll to Settings and press the Center key.
3. Scroll to Messages and press the Center key.
4. Scroll to Preloaded and press the Center key.
5. Scroll to the preferred ringtone and press the Center key.

hi Jo.
this is all i can find at mo.

1. From the home screen, tap the All Apps icon.
2. Scroll to and tap Settings.
3. Scroll to and tap Sound & notification.
4. Tap Default notification ringtone.
5. Tap the preferred notification sound and then tap OK.

Change the phone ringtone and notification sound on your Alcatel ...

devicehelp.boostmobile.com/.../ONETOUCH.../Change_the_phone_ringtone_and_notifi...
if this does not work then go to this link might help you out some more.
How do change ring and text tones on my Pixi Alcatel One Touch Google...

This phone should have Jelly Bean 4.1 or later. One way is to tap settings, sound, phone ringtone and choose whichever ringtone you like the most. Another way is to download Zedge from the PlayStore, you can download just about any ringtone or notification sound, save it in your phone, and right from the app itself you can set the ringtone.

have you tried going to your settings and ajusting the volume frrom there?