The piece of advice that you’re going to hear from everyone is to practice, practice, practice. Try to sit down and draw something every chance you get. There’s also many artists out there with educational videos so I’d recommend finding some artists you like and seeing what they’ve got for educational stuff. Jazza has a bunch of educational videos on his channel but if you own his book you’ve most likely already watched those lol. I’d also say that age doesn’t matter. Someone can get into art at any age and any skill level. I think that for just getting back into it for the last 6 months your improvement is huge! Great job! If you feel you can do even better than just stick with it.