If the amount is low but thick, no need to worry much. Thick semen will become runny after a while due to the enzyme reaction. You check the ejaculated semen from time to time, it will become runny (and so easily flows).

Also to have a bigger amount semen, please stimulate the mind with erotic imagination first (this will produce precum the clear fluid) instead of directly tfk the penis until orgasm.

According to World Health Organization (WHO) standards, the average amount of semen that a guy produces per ejaculation is a paltry 2.5 ml ( that’s around half a teaspoon). The scale of what qualifies as a “normal” amount?  Between 1.5 ml (about 1/3 of a teaspoon) to 6.8 ml (roughly half a tablespoon). 

The hamsap videos usually show guys that can produce a super lot of semen. You don't have to be like that.