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by a_tartaruga 501 days ago
On top of all the great advice here make sure you do as many high quality problems as you can. Some easy ones to build your confidence, a majority that are tough but doable and then occasionally try things beyond your current abilities.

If you can make time for an in person class at a local university or community college 1-3x a week it will probably 10x your progress.

As others are saying you should focus on linear algebra which is the doorway to depth in almost all technical subjects.