Every song is unique, so there can never be a reliable method for writing one. This means that every song involves an element of testing, a time-consuming error. There are also several skills that we must learn because songs are a jumble of parts that move quickly and it's easy to write one that doesn't work. The things you start writing can be embarrassing and weak, and they probably are.
If you rush to be perfect from the start, you won't. Once you realize it as a writer and the tools become more natural (for example, rhymes, syllables, structure, vocabulary), you'll improve. If you Google “tips for writing songs”, you'll get about 2 million results in 0.42 seconds. Most of the time it is 90% crapolla.
But that interesting 10% is very valuable for ideas. So grab your DAW and channel your inner 5-year-old from time to time. Their song “Love Me Do” has exactly 19 unique words. But it's still one of the most iconic songs of all time.
The concept was developed in the 20th century to help composers push the boundaries of what was possible with traditional instrumentation. For example, you can generate four random words that you like and then create a grid of four words that rhyme for each one, creating a grid of 16 words that rhyme. It was developed in the 1990s by Francesco Cirillo to divide sections of focused works and divide time into blocks of time. It is also recommended to divide specific steps or tasks into Pomodoros so that you can divide your routine into a 25-minute Pomodoro for chords, a 25-minute Pomodoro for writing lyrics, and much more.
But if you just want to learn everything about how to speed up your composition specifically, keep reading. If you've decided that you'll spend the next hour writing the letter of a verse, write the letter of a verse. Inspiration can be a big help, but if you only write when you're inspired, you're not practicing what you need to write faster. If you're looking for a piece of equipment or a new studio toy that you want, tell yourself that you have to write 5 songs before you even think about buying it.
That's why making sure you have the right sounds is always important when writing the music you want to write. I can sit with an instrument and have feelings flowing through my fingers at times, but trying to write lyrics is a frustrating process of writing and rewriting and rewriting until I don't hate it (but I never get to a point where I like it). Sometimes, all it takes to write a song is to listen to a new piece of music by a new artist and be instantly inspired.