2 Answers
+ 2
One thing SL tutorial just give you headstart, they aren't enough.
But don't forget that SL has amazing community. Do challenges in play section(not excessive). Then participate in assignments and contests. They will teach many invaluable lessons. Still, they are not much level. So, look here:
https://www.sololearn.com/discuss/1270852/?ref=app
Some assignments here are tough.
One good point here is you will get assistance from pro user. You will get answer from some pros in Q&A section. When you participate in challenges, all other participant look at your code and give suggestions.
Still you will have to keep learning, use sites like hackerrank.
+ 1
You need a lot of practice so go to one of the online sites like hackerrank or codechef or codeforces etc
Try to build some project