What is an alternative way to say "Note that" in academic writing? [closed]

In my academic writing, when I want to connect the context and emphasize something, I almost always use a sentence structure like this:

Note that...

An example in an academic paper is given below:

So my question is:

What is an alternative way to say, "Note that...," in academic writing in the above context? Thank you.

The best advice is: don't. Just leave it out. Readers do not like being constantly (or even repeatedly) reminded to pay attention.

If it is a fact, state it as a fact. If it is an opinion, clarify that it is an opinion. If it is somehow related to other statements, use connectors to clarify or emphasize that relationship, such as however, moreover, nevertheless, alternatively, therefore, despite.

It is to be observed that

(/Please/One should/) Observe that

(One should) Bear in mind that

(One should) Keep in mind that

It's a little more informal, but you can use "Remember that" or "Keep in mind". Alternatively, you could just leave the leader off and say "Valid here only...".