I agree. Fertilizer is somewhat more hype than help. (sorry, the alliteration was too easy to resist.)
I read about fertilizer ( and more potted plant care) from 'tapla' and his discussions really made sense to me.
You want a ratio of 3-1-2. And some micronutrients. That is the ratio that matches healthy plant material. Don't use 'bloomboosters'; they may provoke blooms short term, but good plant health long term and other good care gives you the best results.
Mine of choice found at a big box is Vigoro crystals, comes in a small box similar to and comparable to this
https://www.target.com/p/mirac...
20 2020 is the same as 10 10 10 used stronger. (less diluted, used more often)