Well congrats firstly. Secondly, my advice would depend on where you want to take this. If you want to develop your physics and maths, you would learn a lot by adding some more types of vector.
For example, you could add 3D vectors. I would do them in Cartesian (x,y,z) form first but you'll really learn a lot when you add spherical and cylindrical form. Cylindrical form is also identical to the other main 2D form for vectors (polar)[1]. Spherical coordinates are very useful for modelling certain vector fields (eg gravity) that are spherically symmetrical. Cylindrical coordinates are useful for things like the temperature distribution around a hot pipe or something like that. Polar coordinates are great for representing rotating systems, which will be a real challenge but you will learn an incredible amount from.
To get the background knowledge, I would check out MIT8.01 Mechanics online[2]. It is really excellent and you will learn a lot from it. Some of it you may find hard, but it is deliberately formulated so doesn't have any really advanced maths prerequisites (eg differential equations are kept to a minimum) and the presentation is really clear so if you're motivated you should learn an amazing amount. There is a free textbook included in the course website which covers all the underlying maths.
[1] Cylindrical form just has a z coordinate. If you set that to 0 it is effectively Polar in the x,y plane.
[2] https://ocw.mit.edu/courses/8-01sc-classical-mechanics-fall-...