Every guitarist at some point has felt frustrated, bored or lacking in ideas when he plays the guitar. This state of mind greatly reduces the desire to learn and continue playing the guitar, it can even cause extreme cases to leave the instrument aside. Having fun while we learn is the key. The passion for the guitar, for learning new things and for improving as musicians. Nowadays, with the infinity of resources that we have to learn, it does not have to be all day learning scales or theory. Through backing tracks, playing with a band or improvising without accompaniment can be the best way to progress as musicians and guitarists.
It does not matter if you play four hours a day or twenty minutes, the important thing (as in most things) is the regularity and the habit of doing it daily. Of course you should not feel obligated to do it every day but perseverance and the desire to excel are key to any learning.
Regardless of whether we have a lot or little time to practice, we will make the most of it if we divide our daily routine into parts of work. Having predefined what we are going to do will allow us to allocate the necessary time to each field and be able to cover all the necessary points (theory, scales, chords, harmony, technique, heating, etc).
Every good guitarist will give you the advice to memorize all the notes of the fretboard. It is something that allows you to improvise with ease, know at all times "where you are" and expand your musical vision of the fingerboard to build phrases or chords.
We all love to learn to play fast and focus on improving our technique. That's fine, but you have to stop and think that most of the songs that mark our lives, or guitar solos that have marked a period and will last for decades, do not usually have great technical complexity. They are solos or songs with a musicality out of the ordinary, the old saying "less is more" is perfect for this advice. Look for a good melody, expressiveness in the guitar, personality and use the technique as a complement to these qualities.
Listen to music of different styles, chat with other musicians, attend concerts, clinics, Master Classes, watch instructional videos, music videos, etc. Any motivation is good to encourage us to continue playing the guitar and learning.
Surely in more than one case a beginner guitarist, for the simple fact of having the guitar out of tune has been frustrated and has stopped playing or has lost the desire. It is a simple advice but to take into account
I, like you, are learning more and more about this wonderful art as music is, I hope these tips will help you.