I would agree with the others in that if you struggled with LA, I would only take one course. Diff Q seems to be the normal sequence to take next before Discrete Math.
If you have to take both then I would consider looking at Coursera before the semester begins and sign up for some courses (free for basic) if you want to get a head start on these. Another option would be to take one course now and the other in summer.
Two of my kids are in CS, one in school and one is out. The one out said you don’t really need anything beyond LA for it, the other one had a choice to take either Linear Algebra or Diff Q but didn’t need to take both. LA just happened to work better in her schedule and she had a brief introduction to it in high school, but the class was brutal at her university, as is Diff Q.
You may just be fine even taking both, and your issue may be if your classes are online vs in person, but also perhaps you always did well in math and it came easy and you went in a little too confident. I’m assuming that probably won’t be the case this semester and it may just work.