some crypto traders did block USA IP so rendering themselves non accessibles to US users, as a way to dodge the ongoing raids operated by USA on crypto exchanges. Binance among others does this.
You can use a VPN in order to connect to Bybit (yet not all VPN may work, some VPN providers have also their IP ranges, when known, blocked).
You can try to buy TON instead, from the sellers included in Tonkeeper
you can also just buy crypto with USD Visa from an exchange on bestchange.ru,, that will also exchange crypto to RUB, despite not doing it in one operation VISA USD ->MIR, because regulations.