Welcome!
Sign up for kaniwani. It is free, and gives the reverse questions of wanikani. Created by someone here too.
Sign up for bunpro (grammar). Also made by a user here. I think there is still a free option.
Listen to stuff in Japanese. NHK has hourly news broadcasts. Also daily newsweb easy articles.
TBS plays short news clips around the clock. Most of them are subtitled in Japanese.
(https://news.tbs.co.jp/3snewsi/index.htm)
Read the guide. Read the stories of other people who have succeeded here.
This is the a great one:
Other people will post many other ideas!
Also, read tofugu articles …