As far as I know, there are still no services that accepts cryptocurrencies in exchange for stocks. Stocks, of course, are being regulated by SEC in which it also requires regulated currencies like fiat and there is no way bitcoin can be used to buy stocks.
Perhaps, converting them to your local curreny would be your best bet?
There are some that are.currrently being tested by JPMorgan, I think it was called Bitcoin ETF but I don't think that it is a good idea to invest in it because a lot of financial Youtubers are warning that they might be losing on this one since it doesn't have the same protections that a normal ETF has, also Jamie Dimon is the CEO of JPMorgan and a serious opposer of bitcoin and cryptocurrency so I wouldn't really trust him.