Hi,
I belive being excited was the cause of fail during your wild attempts maybe?
Sometimes being excited, waiting for something or just fearing of something might prevent us from sleeping (Natural Mechanism?),
Times ago i used to be excited for Game's Halloween Updates so much that i were unable to fall asleep and even if i did i woke up quite early out of reason

The same mechanism might prevent your body from putting your mind into dream world maybe because something is keeping it in reality anchored,
Sudden wave of emotions during transition into dream world might wake your body up,
Same during dreams when their stability is low and we get suddenly excited?
Solution for that issue is simple though.
Get used to WILDing State and the sensations you feel during it so they will become nothing to be amused about and then it will be for you much easier to progress with WILDs since attempts won't be disrupted anymore by your emotions.
You can do it faster yet more exerting way too:
Before WILDing empty your mind of any expectations, fears and excitement.
Tell yourself that your just going to sleep, nothing big, except the fact that you will retain awareness this time
If you will start to see hypnagonic hallucinations, hear hypnagonic sounds or just sense transition stuff like vibrations and that will make you feel excited then tell calm yourself and think that:
There's nothing to be excited about, it's just transition into a dream world which i'm having everynight as i enter a regular dreams. So why should i be excited?
You want to be as calm and relaxed as you are when you fall asleep at night.
The best would be just not paying attention to any of sensations
Just focus on technique which you use to retain consciousness during WILD
I myself find it easier to WILD when there's no any sensations or hypnagonic stuff going on.
This stuff tends to distract me and keep stuck in wild transition phase (Or just kick me out of it if i'il play it wrong way?)
The best WILDs i have are those during which i don't get any sensations at all
Just lying in bed, using my choosen technique and doing so till i'il get into dream world
If those sensations happen to me then i try to keep myself a passive observer
If i'il focus, bother myself or care too much with those sensations then it might disrupt or destroy wild attempt.
Example: Focusing too much on hypnagonic images might make them gone (My Personal Experience).
This stuff i wrote down in this post is mix of knowledge from people aswell as my personal experience,
Don't take everything that i wrote down as an absolute truth. I myself had problems with WILDing due to keeping myself limited to other people's words
After i've started experimenting it become way way easier for me to progress with WILDs.
Afterall WILDing is probably most personal technique out of all of lucid dreaming ones

- Goodluck
If you have any other questions feel free to ask
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