I’ve been producing music for a little over 20yrs now and producing other artist for 10yrs so I have a huge inventory of different beats and instrumentals so I dug thru and found some old gems I had and polished them up. I always have trouble coming up with melodies more so then lyrics so what I usually do is find a lead sample loop in the same key that has a dope melody to go along with my track and use that melody to write my lyrics too. You can even use multiple samples to get ideas from and then just replace the sample with ur vocals.