Welcome to the board!
In my opinion, there is nothing one can add to boost a plant's natural performance.
Maximum growth and flowering occurs in a plant that is completely happy - correct light levels, temperatures, humidity, lots of air to the roots, and adequate water and nutrition. In other words, a stress-free environment. Increasing any of those parameters does nothing positive.
"Booster" chemicals don't. They might reduce or eliminate something that inhibits the plant, but they cannot "add" to the plant's natural capabilities.
I also contend that fertilizer is of "second tier" importance - it may affect how well a plant grows (captive cultured plants are usually better than ones in the wild), but it is not a "life or death" requirement. A poorly fed plant may not grow or bloom well, but one that is poorly watered or that does not get adequate gas exchange at the root system can die.
As you do a lot of "rescuing", one thing I can vouch for is under-pot heating (thanks to Ross for "turning me on" to this).
This is not anything new or spectacular, as the use of bottom heat is a long-standing method of getting seeds to germinate quickly, but by putting a plant on such a mat and heating the root zone, the plant is "pushed" into active growth as if the season had changed. it is an excellent way to get new roots to grow, and will help "break dormancy" in some, as well.
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