You could say my prefix aims for the top.
My infix with my suffix sets a strong foundation and just like here, seldom used on its own.
But my suffix really sounds like it puts it all together.
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Reinforcement
You could say my prefix aims for the top.
Rein sounds like reign which means to be the best or most important in a particular area (this explains the "you could say" part as a homophone indicator).
My infix with my suffix sets a strong foundation and just like here, seldom used on its own.
Forcement which can mean compulsion (although somewhat obsolete) and compulsion is an essential ingredient in any endeavour to aim for the top.
As Stiv mentioned in the comments the "it" here may just refer to the infix, for, which is usually used along with another word in a sentence and can't really be used on its own.
But my suffix really sounds like it puts it all together.
Cement - as in MacGyver88's answers
Title
Reinforcement is the act of strengthening something. It also reminds me of the idea of reinforcement learning which is a machine learning technique that gets better at a particular task over time.
Second Attempt
REPLACEMENT
You could say my prefix aims for the top.
REP - The more REP you earn, the closer you get to the top
My infix with my suffix sets a strong foundation and just like here, seldom used on its own.
PLACEMENT - To set something, like a foundation? Play on PLACE and CEMENT? - Not sure
But my suffix really sounds like it puts it all together.
CEMENT - Holds things together
Title
Replacing bad habits or routines with new good ones? Coincidentally, I'm replacing my previous answer with what I hope is a better answer.
Previous
ADVANCEMENT
You could say my prefix aims for the top.
AD - Adverts at the top of screens
My infix with my suffix sets a strong foundation and just like here, seldom used on its own.
VAN on CEMENT - a van works best on a road
But my suffix really sounds like it puts it all together.
CEMENT - Holds things together
Title
ADVANCEMENT - an act of moving forward. - promotion in rank or standing;
Could be used to mean: to become better.
Could the answer be
open
You could say my prefix aims for the top.
op -- original posters aim for quality in their posts.
My infix with my suffix sets a strong foundation and just like here, seldom used on its own.
pe and en -- physical exercise and English sets a strong foundation
But my suffix really sounds like it puts it all together.
en -- English is what put this riddle together.