I tried writing down my memories about dreams, waking up at 3 am and taking supplements then going back to sleep etc.
I managed to remember dreams better or to increase my senses and perception in dreams. Never managed to have a lucid dream tho
If you are already at the point where you can clearly remember more than 1 dream when waking up, I'd try the MILD (Mnemonic induced lucid dream) technique for one week. In a nutshell, you try to make doing a dream check into a habit in the hope that it'll randomly happen within a dream.
The brute-force method is to just set a vibrating alarm on your phone every 30 mins to force you to do the dream check all the time, there is also an alternative version to this that I've found works better though:
You set vibrating alarms every 30 mins and try to see if you can come with doing the dream check yourself naturally before the next one triggers, if you remember to do a check within 5 mins of the next alarm, then just skip the alarm.
As for the dream check itself, one might work better than the other depending on the person, so there is no one size fits all for it, my favorite is counting the fingers in your hand, more often than not I have extra fingers If I'm dreaming and not yet fully lucid. Common ones include:
-counting fingers
-reading the time in a clock twice and have it change
-reading text twice
-flipping a light switch and have it fail
-Jump and fall slowly
-close your nose and try to breathe
... a quick google search will come up with a bunch of tests, most of them have some actual basis as to why they work, e.g. breathing while closing your nose works because your actual body does breathe while asleep.
The other technique you were using (WBTB wake back to bed) could eventually work, but you need to try different times (try adding 10 min to the alarm every day until you find the right spot), no need to take supplements, you want to wake up exactly before entering one of the REM phases, and go back to sleep immediately afterwards. You could also set up a camera pointed at your face and record yourself while sleeping, then the next day just fast forward the video and note the timestamps of the REM phases.
If you are into electronics, you make a DIY mask that detects the REM stage and the flashes your eyes with some low power LED's. You'll be able to see the light within the dream and use that to trigger the lucid dream, there are a bunch of DIY tutorials online for those.