(I've made 12 and released original songs with lyrics, vocals and fully-produced instrumentals)
For me, my process for the lyrics specifically often began by choosing things about myself and my life I wanted to share. I occasionally chose topics of hypothetical futures I wanted to experience like falling in love again, which I draw from imagination and maybe a bit of past memory.
As for the specifics, I am often inspired by lyrics of my favorite songs too, where I might love a line or two in a song and choose to use it rearranged in another way or rephrased. I will also use multiple different types of rhyming and syllable patterns for each song, and even within a single song. The verses may go like this:
Letter = Rhyme
Number = Syllable Count
A7
B9
A7
B9
Or,
A7
A9
B7
B9
and the chorus may go like this:
A8
A8
A8
B6
It's cool to experiment with different rhyming patterns and to change them up in a song, especially if the chords change for the chorus and drop.