For me it depends on why I’m struggling to how I “fix” the problem.
I am biologically predisposed to having a delayed sleep rhythm, I’d like to go to sleep about 2am and wake about 10am, but society judges that kind of behaviour as bad when you aren’t a shift worker. So I have to either survive on minimal sleep or catch my sleep cycle about 8pm and have a super early night. It might be worth looking at your circadian rhythm and seeing if that helps.
Other times when I’ve been pretty routine in going to sleep but struggles with wake up I’ve eventually discovered there was often an outside influence, for example the time I lived in a house super close to a railway line, the night time freight would disturb my sleep enough to semi wake me about 2-3am and screw up the rest of my night. Often there’s not much you can do here but use ear plugs and/or hope you become accustomed to the routine waking.
Other times I’ve found random things like not feeling ready for bed because of outstanding tasks or thoughts that need dealing with. This is easily fixable with a night before routine and making reminder notes. I’ve also found in this case a training myself to have a sleep trigger really helpful, for example I listened to the same (chilled slow beat) song every night when I was drowsy, within a week or so my suggestible little brain got sleepy hearing it -et voila early night.
Then there are times where internal problems disrupted my sleep, being too warm, too cold, low level vitamin and mineral deficiency, mentally tired but not physically. Again you just have to figure out the thing and fix it by taking a supplement or doing some pre sleep yoga or taking a shower.
So in all these situations half the battle of getting up early was getting some good sleep first.
Now for the waking up part and being motivated to get out of bed, you have to know yourself… I layer a few techniques for me. 1 I have Alexa wake me and she is set to greet me with a reminder for my medication, the news and some chit chat I’ve pre programmed. 2, I have an alarm the other side of the room that is either my old fashioned bell alarm clock or my clock radio (this second one does not alway work perfectly and I can get back into bed.) 3, I’m food motivated so always have a an exciting breakfast to lure me out of bed and into the kitchen.
This is obviously harder on some days than others and the winter months are a bastard (which is where a wake up light can help) but 90% I’m good with getting up. The key to it is routine, even if you have to vary it/cycle through various different techniques to keep them fresh.