Hey you, don’t get frustrated. 3 months is a very long time for a level though. That is about 1 or 2 items per day… I’m sure we can improve that.
First of all read this great guide so you fully understand what is needed to level up: My Journey of 368 days (+ The Ultimate Guide for WK 📖 ) - #665 by mariodesu
Most important thing is to do the level-up reviews as soon as you can. At least twice a day, but I prefer to do my reviews almost every hour to keep the review batches a bit smaller.
I’m doing 7 days per level and on average that’s learning about 20 to 25 vocab per day. Some of those take more effort to remember but the meaning can often be clear already when you know the kanji. For me the first levels were the hardest, after a while it just gets easier.
If you would do around 10 lessons per day you would be finished in around 2 years time.