hi. i don`t usually upload my traditional arts anywhere, but when i did, i used advices from this video to make them look better → https://youtu.be/ynET0ZYAq_M
hope you find some tips in it informative.
also, if you`d like to try digital art, i can also suggest you trying to color your traditional drawings. here is video where this process shown → https://youtu.be/j9Ub_IdceF4
regarding your other points, i can tell you that becoming popular artist is a tricky stuff. popularity overall is more about being good in social media marketing, which involves choosing popular topics over your own preferences. if drawing your own ideas makes you happy, don`t rush for other people`s approvement. it will come itself eventually, but if not, that`s not necessarily bc you are bad in art. Van Gogh sold only few paintings in his lifetime, but after his death he is concidered as one of the greatest artists of his century. i think he was upset about his drawings not being recognized by people too. but it was his passion, and lack of praising and appretiation didn`t stop him from creating his paintings. so shall we all do, i think. just don`t validate yourself or your art based on likes/favs ratio.
i hope some of my advices will help you <3