Insecurity on job change

I am working as SDE 2 in Amazon, doing well for now, getting good work however i always have this feeling that one day i may end up losing job due to layoff or anything else and the thing is that in such a scenario i am not at all prepared for job change. I never liked doing DSA or you can say i was never good at it. I did just enough to get an internship at Amazon and then got converted to full time and from there i never touched DSA again.

How to get over this insecurity ?