This is where Satori Reader can help you with its HJ extra credit section. You can add cards of vocabulary from the sentences into the studylist inside SR and use their srs system to learn them.
Since you can integrate your Wanikani progression into SR with an API token, you’ll be able to see vocabs you’ve already learned in WaniKani with their kanji, instead of kana only.
The UI of SR is very flexible, and I recommend taking the tour of how to use SR to familiarize yourself with all its options.
If you don’t want to commit to another srs system at this stage, which is totally understandable, you can do a few more levels in WaniKani, and learn more vocabs with it.
It’s hard at the beginning, because everything is new, every single word. So every sentence is a grind, but that’s the way it is at the beginning. Give it time, be patient with yourself, the exposure will get you there eventually.