Going back into dreams

[Nexusery]

So i have had a lot of lucid dreams lately and i have 1 problem when i wake up in a dream everything goes fine i got full control and all but then after just a little bit of time i start losing and everything gets all wierd its really hard to explain. Example: I had one lucid dream not so long ago where i was on a jet ski with my friend and we were chased by the police after some time i realised "This is a dream" the jet ski was gone and i was on the ground at some beach i was jumping a bit and the gravity was lower i was falling 3 sec after jumping really little then i walked around a bit and there was this masked man with 1 round opening on the left side and he had this red glowing eye. When i started looking at the eye its inside started changing and i was paralysed, this whole time i was thinking him as a friend. Then he sucked me in his eye into another dimension where he "killed me" and then when i closed my eyes i could move normaly but then after some time while my eyes were closed i started thinking of waking up and i woke up after a feeling of transition. This whole dream i was reminding myself i was dreaming and nothing is real so i dont know what went wrong. This mostly happens in all of my dreams i start doing something than always forget what i was doing and it ends. I just want to be able to get back into dreams when im about to wake up. Any suggestions?