You are young and with your skill, you may reach a master title in some years if you have talent and you study a bit in an efficient way. That can be good for your cv and good for your life and satisfaction.
You must know the difficulty to climb from 1800 to 2000 may be as hard as from 2000 to 2100, or from 2100 to 2150, or from 2275 to Fide Master etc. It is so hard because imagine you play 5 games with 2200 ELO against 5 players rated 2000, you draw 4 and you win 1; you are gonna lose some of your points!
Players that plan to reach FM title use to study with the assistant of a good trainer on a club. That doesn't mean to study more than the 5/10 hours/week you are currently spending on it, but to planify correctly what to study -benefitial opennings, weakness, ...-. And you will need to play federated games, of course, so if you gonna seriously for a performance of your ELO, chess will take most of your afternoons on weekends -game plus some time to prepare it against specific opponents-.
If you plan to do a maths degree, it migth be valuable to have a high level and play for your university and study there. You will also meet people wich is always nice when you are new on a site.
If this is not going to happen soon, you can continue studing a bit, books as "My system" of Nimzhovic, do some tactics, play some correspondance and not only rapid games, analyze your mouvements when the game is finished, watch videos of your favorite opennings, try new ones,....
I haven't seen you playing, but if you were going for GM/professional skill, you should be trained by a master and take some more of your valious time spent studing your lovely mathematics, and I guess that is not what you have on mind.
You can take as an example about how hard is the best chess player of my little spanish region ever. He did 3rd on national spanish championship on 2016, but he has not reached GM -he has been very close, but unfortunately he has still not got it-.
I followed his facebook profile while playing an international open. He was rated 2480 if I remember well -and I think he has yet the normes, he just needed 20 points to get the title-. He complained, after drawing against a 18 years old russian rated 2250, something like:
"Today I played against a 18 years old russian. He played 30
consecutive book moves of a line I knew well, where there is only a
chance for black to draw it."