Best nutrients for indoor growing in Happy Frog soil

I'm looking to get new nutrients for foliage.

My current nutrients are 3 years old and I'm thinking I can probably do better...

Water supply: well water, no Fluoride, no Chlorine, some Iron: already filtered (planning to run it through a PURR filter, just cuz). Adding 7 drops / gallon hydrochloric acid to drop Ph to ~6.2.

I'd like some expertise on what the most experienced recommends for nutrition and more plz.

Been using unfiltered well water since 2018. In 2019 I switched from Fox Farm to the Remo line and have been happy with the results.

I may switch to their Elements in a couple weeks cause I am almost out of the liquids.