Glad to see you getting enjoyment out of the Tele, looks fantastic!
Jamming over backing tracks is great for "putting it all together" as you can apply any techniques, scales and melodies you have learned so far, and does wonders for developing your style.
When improvising you can try throw in a few licks from songs you have already learned (or search YouTube for licks from your favourite artists). Once these become second nature this can aid in developing your own licks and keeps your improve sounding fresh, and often allows you transition to other areas of the fretboard. Also trying jamming in different keys!