Ah yes, the joys of being a new player. What to do, what to play? What keyboard should I have? What scroll speed should I use? What skin? What maps are good for practice? All these questions are so common in the osu!mania community, it's almost like we should have some kind of central FAQ section for it.
I was in the same boat as you. Judging from your profile, it looks like you can only play the easiest of maps. Also judging from your profile, it looks like you haven't really dedicated yourself to the game since you joined 2 years ago. That's OK! There is always time for improvement! Now, let's get started.
[STAGE 1] Since you can only play around 2*, you obviously have very little proper muscle memory to play even the simpler patterns. At this stage, you need to just play what you want and enjoy yourself. In about two months of hard playing (also known as grinding), you will probably find yourself playing 3*-4* maps. This is where it gets hard.
[STAGE 2] Once you are a 3*-4* player, you will need to train specific patterns (a.k.a. skillsets). You need to shift AWAY from ranked maps as much as possible and generally stick to unranked ones. The reason? Ranked maps are focused on making it as easy as possible to gain PP. As a result, you will become great at farming, and the patterns featured in these so called "farm maps". As a side effect, you will be not-so-great at the patterns featured in the harder maps of osu!mania. Am I saying to stop playing ranked? Of course not! Just don't make the focus of every session, "I GOTSA GET PP NOW AND AI WANT RANKE".
[STAGE 3] You have mastered the patterns in 3*-4* maps, and you want to get serious. Getting to 5*+ is an amazing accomplishment. Now you REALLY have to train patterns. Now is the time in which you may want to consider switching to a game called Etterna:
https://etternaonline.com/ It will allow you to further refine your skillsets and become a truly good player. Not that it's impossible to get good from osu!mania; it just gets really hard.
[STAGE 4] You have fought and fought and you are able to complete even 7* maps (me!). Good job on your incredible improvement! You should treat yourself to a cookie. You earned it. Now, unfortunately, this is likely not quite good enough to get accepted into official tournaments like MWC, but you will still be able to pull of somewhat crazy scores.
[STAGE 5] You have pushed through months upon months upon months of being still reletively mediocre and you have finally got to the point where everyone around you is like, "Bro, this DUDE is GOOD!" You have become a legend. Every time to livestream yourself playing, a crowd of 500+ gathers and watches you in admiration.
[STAGE 6] silly fangirl sointu jakads wonder5193 etc. you are unstoppable.
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Everything I just said above will happen. Unfortunately, I can't tell you when these things will happen. Everyone has their own improvement timescale, so to speak. On average, it takes 5 years to get to Stage 6. Some people have managed to get to that stage in a year and a half, which is mighty impressive. I have been playing for 1 year and 5 months and I am at Stage 4.
Here is a timescale that I think you should follow pretty accurately. Note that in order to fall in this timescale, you have to be MOTIVATED. You have to spend hours on osu! or Etterna or [insert rhythm game here] to fall under this timescale. You can do it.
Seeing as you are a beginner, we will start with your skill level now.
Now: Stage 1
1 MONTH FROM NOW: Stage 2
2 MONTHS: Stage 2
3 MONTHS: Stage 2
4 MONTHS: Stage 2
5 MONTHS: Stage 2 (it take a long time dont it)
6 MONTHS: Stage 2 (yeah, 3*-4* is pretty broad)
7 MONTHS: Stage 3 (it takes a reeeeeeeeeeeeeeeeeeeeeally long time to get to stage 4)
8 MONTHS: Stage 3
9 MONTHS: Stage 3
10 MONTHS: Stage 3
11 MONTHS: Stage 3
1 YEAR: Stage 3
1 YEAR, 1 MONTH: Stage 4
You will be in Stage 4 for a few years, if you're lucky. Trust me, rhythm games are something that you DEDICATE to.
~2-4 YEARS: Stage 5
You will also be in Stage 5 for a while, usually a few more years.
~8-10 YEARS: STAGE 6
You are now messing with the big boys.
Note that this time scale is based off my personal experience. Feel free to let me know if I was completely wrong. Everyone has their own timescale, but this seems to be the average.
Thanks for reading this rather large post! See you in MWC someday :3