You can purchase Dlpoint on dlsite (or something) with money, which can be used to purchase games. I can’t help any further than suggesting that
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You can use DLPay (https://dl-pay.com/) to buy DLsite points.
Select the amount of points desired, than use PayPal to pay.
Once finished, it will generate a Serial Code do redeem the DLsite points (https://www.dlsite.com/maniax/mypage/user/serial/point).
Other option is to buy DLsite points from other 3rd party sites (Ex.: Tokyo Otaku Mode) were payments are broader (but the ratio price/points is higher).