23, erection problems

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I'm almost 23 and have erection problems. Got stuck on using viagra, now it might have evolved to something psychological although i'm not sure because my test level is kind of low - 465 ng/dL (16.1355 nmol/L).

I don't watch porn, i do not fap, have sex often (taking fucking pills), i lift 3 times a week, i'm not fat, my diet is relatively good (no fast food, trying to eat clean), i take premium multivitamins, ZMA before bed, vitamin D because of deficiency, will get fish oil.

What else can i try, /adv/? I've visited urologist and he said that blood and urine tests were fine, only talked about relatively low test and adviced taking Tribulus to increase it and also to take small doses of Cialis (5mg) but am not sure whether it's the right path. He also talked about penis pump but i thought it's for elderly people, don't feel like trying it. It's killing me.

I'm thinking about trying to focus on cardio in the gym rather than on muscle making. Can this help? Looking forward to your help, anons.