It sounds like you've finished your Spanish Tree - Congratulations! One option is the Reverse Spanish Tree. Otherwise, branching out to other resources such as www.memrise.com, www.Clozemaster.com, www.mondlylanguages.com, www.lingvist.com, etc.

Have you tried Duolingo Stories yet? They are fun!

There are a few suggestions here - https://www.duolingo.com/comment/24632807

I'd suggest childrens books for reading practice, there are a few at http://www.childrensbooksforever.com/index.html or check your local library (see https://www.duolingo.com/comment/24720064 for other ideas on this).

For listening practice there are many videos on youtube (like easy Spanish, or childrens tv shows in Spanish, like Pocoyo) and also lyrics training https://lyricstraining.com/es/

Do the reverse tree (makes you type into L2 target language Spanish).

Have you already had a look on Mondly: https://www.duolingo.com/comment/23524002/Mondly-languages-added-19-new-topics-to-their-tree

Recently I came across "uTalk" (have not tested it).

You will soon notice that the lessons start to lose their gold color, inviting you to go back and review them again.