Welcome!
Here’s my recommendation based on my own experience.
First: Use this script to help manage your lessons: [Userscript] WaniKani Lesson Filter
Using that script,
- Do all your radical lessons on day one of a new level.
- Do roughly 4 kanji and 8 vocab items every day using the above script. (I had my batch size set to 4 and did three batches a day).
By using this script, you can adjust your pace pretty easily. The above lesson ratio should let you level up in about 12-15 days. If you want to go slower than that, do fewer lessons. If you want to go faster, do more. Just make sure you do 2-3 times as many vocab lessons as kanji lessons every day so you don’t get behind on your vocab.