It's possible, but you need to have a lot self discipline and patience. The key is in that two factors. You are working 3h daily on tactics? That is great it will help you, it will develop your tactical vision but in a real game you need to luck not only your possible moves - you need to look for your opponent best move or some of his/her possible replays to your move. Great exercise for that is mate in two moves (or three)! You take a notebook and then you write any possible move you can make and then you write every possible move your opponent can make. You keep repeating that until you give a checkmate in just two move. Writing will help you see all the moves, it will help you develop calculating ability and it will help you stop blundering.
But that is just one piece of the puzzle. Chess is not just tactics. To be master you need to be very good at calculating, strategy, endgames, positional play and openings. You can train openings last when you stop blunder pieces. Stop playing blitz games and start your learning from zero. Give your self a time, that is very important. You will get better, just not in a short period of time, not over night. First step - try to reach 2000-2100 in tactical trainer. When that is accomplished, train endgames, thru endgames you will train tactics, calculation, a bit of strategy and vision. When you can look at the board at endgame and get a filling that you can see the result even without calculating deep (for example Q and K vs K and pawn - you have king and pawn and your opponent have K and Q, it's your move - your pawn is on the 6. rank your king is close , your opponent king is far away and the queen is in the center. What now? You will probably resign, or try to promote or try some deep calculation. But if you know your endgame theory and you did some practice you would know that if the pawn move to the 7. rank and if that pawn is the rook or the bishop pawn and the opposite king is far - the game is draw - if the pawn is the central pawn or a night pawn the game is lost (not always but in 99%)) then is the time to start learning chess theory - why is developing important, why is the center important, the open file, the semi open file, the weak square, the weak point, what is a combination, how to realize the material advantage, strong square, outposts, the queen-bishop battery, the queen-rook battery, the windmill, the pin and why is important to analyze your games and the need to analyze masters games ... All the material is out there all you need is SELF DISCIPLINE and PATIENCE. The rest will come to you thru time.
Actually I totally get that. I played some offbeat stuff for a while, and it's really amazing how it transposes into all sorts of openings across the full spectrum of chess.
For example 1.e4 d5 2.exd Nf6 sometimes with e6 sometimes with c6 gives you all sorts of french, caro, slav, but also some sicilians, QGA. After 1.e4 d5 e5 of course you can get advance french structures but the bishops can come out, so caro-like stuff too. After 1.e4 d5 2.Nc3 d4 you can get some KID / Spanish like structures. 1.e4 d5 2.d4 dxe 3.Nc3 Nf6 4.f3 is a Blackmar Diemer.