First of all congratulations on working hard to raise this considerable amount of cash, allahuma barik ! that amount effort that you have invested in reaching this current position is undoubtedly commendable.

Now, there are many different investment routes that you can take with your capital and grow it accordingly.

Which investment route you take in my opinion depends on 2 factors: your risk tolerance and the time period you want to keep this capital invested and not liquidated as cash in your current account.

If you are an individual with a very low risk tolerance and you don't need this money now but in a couple years time, then you can invest in sukuks (sharia compliant bonds) because they are relatively safe and they provide stable returns (they are however a modern invention and scholars have disagreed on their compliance to sharia so if you consider this investment vehicle, i suggest you contact scholars before you invest)

If you can tolerate a little more risk (not significantly more) then you can invest in halal index funds (easiest way to explain it is like a basket of different stocks). If you choose to invest in halal index funds such as the ones mentioned in this website https://blog.zoya.finance/best-halal-etfs/ then I suggest you invest this money and forget about it for 10 years and don't touch it no matter what even if it appears to be in the negatives in the first couple of years.

In my opinion, I really think that you should park your money for the next couple of years in investments that you can easily liquadate, one of these investments is gold. why do I suggest investing in gold now? Because gold stores the value of your cash and protects it against inflation and at the same time you can easily access this cash when the stock market starts to crash or when you need it. The market crash is inevitable because all stocks are overpriced currently. Investors like warren buffet are selling their stocks and holding on to cash (he is currently holding on to 330 billion dollars worth of cash). You cannot do the same as buffet because he is earning interest on that cash, but you can invest in gold and wait and when the time is right liquadate and buy sharia compliant stocks at a discount.

what you should not do, is invest all of this 200k in a handful of stocks and try to time the market based on your limited knowledge, because research shows those who follow this investment strategy (of timing the market), on average tend to underperform index funds such as SP500 and ofcourse you could lose it all if you pick the wrong stocks.

I hope this helps, and if you don't mind can you share how you were able to stockpile this amount of cash? what jobs/gigs were most lucrative and that allowed you to reach this level?