no reply from potential supervisor
Like user avid, I used to get several of these and they were easy to ignore. Even retired for several years, I get a few. Some ask me to join my lab (which I never had). Others are from wildly different fields. Straight to trash, or even junk.
You seem to have avoided some of the pitfalls, provided that your field really is relevant to what the professor does.
But you ask too much. You've flooded the professor and implicitly asked for some analysis of all that is there. The CV as a pdf is overkill, for example. It is too early for that. Many recipients will stop reading after your first or second sentence. You will be immediately dumped with the others that are even more off base.

Dear Professor Buffy
I am inquiring whether you are accepting students at this time. If so, I'd like to discuss with you my qualifications and interest. I can provide whatever background information you need to evaluate my candidacy.
If you will have a position open in the near future I'd like to apply.
Sincerely panipiridin

You will be more likely to get some reply. Even if it is just &quot;sorry&quot;, letting you know to move on. But if the reply is as simple as &quot;say more&quot; then you know you have an audience.
But it requires very little on the part of the busy professor, so is more likely to succeed. Don't ask for a lot in a contact email.
But, of course, do your homework first, so that you don't wind up wasting anyone's time, including your own. Make sure you have an idea of what that prof is really interested in. Prowl their web pages. Read a paper or two. Be ready to answer simple questions about that area of research.

I assume in the above that you are in a place/field in which early acceptance by a professor is required for admission to a program. That isn't universally the case, so understand the overall system too. For example, in the US in mathematics or CS it is normally the case that you first get accepted by the university. Then you start some coursework. Then you find an advisor. But here you get to have the conversation in their office and don't need (and shouldn't use) email.