The end of a lot of these novice linear progression programs is nothing short of brutal.
You need a recovery period afterwards. The normal transition from SS to the texas method, for example, has you return/beating your SS maxes after 4 weeks*
My question is how did you pick your weights for 5/3/1 and how did the weight feel?
*No one ever tells you that you need to be super intelligent (as a novice) about the end of the novice progression otherwise you spend 4-6 weeks crawling to add a few lbs then you have 4-6 weeks of resetting. That is, your optimal progress for a beginner has a good likelihood of coming with a chaser of 2 to 3 months of wheel spinning. And God help you if you’ve done no conditioning and eating for strength as also recommended for optimal progress