how to get to 1300 blitz

Just curious, how did you device on 1300? Is there a particular reason? If you just picked a rating slightly higher than your current one to aim for, usually people set short-term goals in intervals of 100 or 200 points; these are more attainable in steps. You can still work towards 1300, but it might make sense to aim for 1000, then 1100, then 1200 and then finally 1300. Maybe it doesn't make a massive difference right now, but at the higher ratings, you'll see just how long it can take to reach new milestones and especially so if they are as far away as 300 rating points. Even just 2100-2200 could take 2-3 years for some people (or so I've heard, I've never been there myself) and World Champion GM Magnus Carlsen has been over 2800 rating for literally a decade (10 years), but has yet to gain even 100 rating points (even though he has talked about his chances of reaching 2900 or not).

In the case of bridging the gap from 1000 chess.com rating to 1300 chess.com rating, there isn't a ton of "new" things as much as just improving on things. Let me put it another way. You probably have done some chess puzzles (or tactics problems) to reach 1000 whereas 1300 is just a higher puzzle ability, but not a particularly new skill. Same thing goes for chess opening principles https://www.chess.com/blog/KeSetoKaiba/opening-principles-again and opening theory you study. A 1300 doesn't usually know much more opening theory preparation compared to a 1000 player, but they just tend to be a little better and last a little longer with book mainlines.

The only "new" thing I can really think of might be what endgames you know if you haven't learned most of the basic ones already. By "basic endgames" I mean fundamental "theoretical endgames" such as King + pawn vs King or basic checkmates such as King + Rook vs King. 

We could even play some unrated live chess sometime for learning if you like, but I believe that reaching 1300 is mostly just expanding your already existing knowledge of chess. At 1000 rating, you probably know the rules well and hang pieces outright much less often than the lower ratings, whereas 1300 is just hanging a little less often (including one-move tactics which could be played against you) and slightly expanding your already existing chess foundation

Thank you so much for your time and your precious advice ! 

I would be delighted to play against you someday ! Let's keep in touch ! 

Thanks again !

Why this opening? Any particular reason? It isn't even the best objectively speaking (which is one reason this opening is hardly ever seen at the highest levels). Perhaps this opening could get some players out of their opening theory if they are unstudied or this opening can help teach the player to attack, but other openings have these benefits too and are more solid. 

At 1300-ish level, I'd just pick an opening I was comfortable with that is also a solid opening I can stick with indefinitely if I decide I like it enough to stick with it.