"to make my plan come to fruition"

Consider "I make my plan come to fruition"

I = subject

make = verb

[my plan] – NP = object

come = verb complement (as part of a causative verb structure)

to fruition [preposition + noun = adverbial modifier]

Now with “I make” replaced by “to make”:

To make = in order (subordinating conjunction) to make = infinitive, and the rest remains the same.

I took action [to make my plan come to fruition]

[To make my plan come to fruition] is a non-finite to-infinitival clause. To be exact 'to make my plan come to fruition' is a non-finite complement of the noun action.

CGEL discusses this on page 1259

Many nouns license non-finite complements, all to-infinitivals:

It is syntactically similar to:

[11ib] Kim’s decision [to go to Bonn]
[11iib] Pat’s eagerness [to help us]
[11iii] the opportunity [to make a quick profit]

CGEL, p. 1259

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On a deeper level, it can be analysed as a catenative construction.

Catenative construction:

Non-finite clauses occur in a wide range of functions, as complements, modifiers, and supplements. One function that is worth drawing attention to here is that of catenative complement in clause structure:

[2iia] Max seemed [to like them]
[2iia] Everyone believed Kim [to be guilty]

[2ib] Jill intended [to join the army]
[2iib] She asked me [to second her motion]

The term ‘catenative’ reflects the fact that this construction is recursive (repeatable), so that we can have a chain, or concatenation, of verbs followed by non-finite complements, as in:

She intends to try to persuade him to help her decorate her flat

(CGEL; p. 65)

In the OP’s example, the catenative construction looks like this:

I took action [to make my plan] | come [to fruition]