In addition to Sam Nead's answer, which is about how to get started in math research, I want to direct the OP's attention to many lists of open problems in graph theory. For someone with a background in the IMO, who likes problem solving, this is a concrete way to get into research. If you manage to solve one of these open problems, you can publish the solution (there are several MO threads about undergrad math journals that you might find useful, e.g., [this one][1]). 

Ok, lists of open problems in graph theory:

http://dimacs.rutgers.edu/~hochberg/undopen/graphtheory/graphtheory.html

http://www.openproblemgarden.org/category/graph_theory

https://mathoverflow.net/questions/191495/collection-of-conjectures-and-open-problems-in-graph-theory

https://mathoverflow.net/questions/225870/open-problems-for-undergraduates

https://mathoverflow.net/questions/27716/does-there-exist-a-comprehensive-compilation-of-erdoss-open-problems

https://en.wikipedia.org/wiki/List_of_unsolved_problems_in_mathematics#Graph_theory

https://mathweb.ucsd.edu/~erdosproblems/

https://dwest.web.illinois.edu/ (two links to lists of open problems)

https://sites.google.com/site/sophiespirkl/open-problems/2020-open-problems-for-the-barbados-graph-theory-workshop

https://web.math.princeton.edu/~pds/barbados17/openproblems2017.pdf

Open problems in spectral graph theory:
https://arxiv.org/abs/2305.10290 and https://arxiv.org/abs/1907.04349

https://www.cs.upc.edu/~sedthilk/grow/Open_Problems_GROW_2013.pdf

https://web.math.princeton.edu/~tunghn/2022openproblems.pdf

https://www.quora.com/What-are-some-interesting-unsolved-problems-in-graph-theory-or-topology

https://web.eecs.umich.edu/~qstout/constantques.html

https://www.stat.berkeley.edu/~aldous/Talks/OP2018.pdf

https://faculty.washington.edu/steinerb/openproblems.pdf

http://www.math.iit.edu/~kaul/talks/OpenProblems.pdf

https://www.semcoop.com/graph-theory-favorite-conjectures-and-open-problems

https://link.springer.com/book/10.1007/978-3-319-97686-0

https://old.renyi.hu/~miki/XianSlides2021f.pdf


  [1]: https://mathoverflow.net/questions/365808/publishing-undergraduate-research